VANGUARD/WELLESLEY INCOME FUND INC
497, 2000-09-28
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                                     PART B

                         VANGUARD WELLESLEY INCOME FUND

                                   (THE FUND)

                       STATEMENT OF ADDITIONAL INFORMATION

                   APRIL 21, 2000; REVISED SEPTEMBER 29, 2000


This Statement is not a prospectus  but should be read in  conjunction  with the
Fund's current Prospectus (dated April 21, 2000). To obtain, without charge, the
Prospectus or the most recent Annual Report to Shareholders,  which contains the
Fund's financial statements as hereby incorporated by reference, please call:

                INVESTOR INFORMATION DEPARTMENT: 1-800-662-7447


                                TABLE OF CONTENTS

DESCRIPTION OF THE FUND..........................................B-1
INVESTMENT POLICIES..............................................B-3
FUNDAMENTAL INVESTMENT LIMITATIONS...............................B-9
SHARE PRICE......................................................B-10
PURCHASE OF SHARES...............................................B-11
REDEMPTION OF SHARES.............................................B-11
YIELD AND TOTAL RETURN...........................................B-11
MANAGEMENT OF THE FUND...........................................B-13
INVESTMENT ADVISORY SERVICES.....................................B-16
PORTFOLIO TRANSACTIONS...........................................B-19
COMPARATIVE INDEXES..............................................B-20
FINANCIAL STATEMENTS.............................................B-22
APPENDIX--DESCRIPTION OF SECURITIES AND RATINGS..................B-22

                             DESCRIPTION OF THE FUND

ORGANIZATION

The Fund was  organized  as a Delaware  corporation  in 1968,  reorganized  as a
Maryland  corporation in 1973, and then reorganized as a Delaware business trust
in May, 1998. Prior to its reorganization as a Delaware business trust, the Fund
was known as  Vanguard/Wellesley  Income Fund,  Inc. The Fund is registered with
the United States Securities and Exchange  Commission (the Commission) under the
Investment  Company  Act of 1940  (the  1940  Act) as an  open-end,  diversified
management investment company. It currently offers a single class of shares, but
has the  ability to offer  additional  share  classes.  There is no limit on the
number of full and fractional shares that the Fund may issue.

SERVICE PROVIDERS

     CUSTODIAN.  The Chase  Manhattan  Bank,  N.A.,  4 Chase  MetroTech  Center,
Brooklyn,  New York  11245  serves as the Fund's  custodian.  The  custodian  is
responsible for maintaining the Fund's assets and keeping all necessary accounts
and records of Fund assets.

     INDEPENDENT ACCOUNTANTS.  PricewaterhouseCoopers LLP, 30 South 17th Street,
Philadelphia,  Pennsylvania 19103, serves as the Fund's independent accountants.
The accountants audit financial statements for the Fund and provide other
related services.

     TRANSFER  AND   DIVIDEND-PAYING   AGENT.  The  Fund's  transfer  agent  and
dividend-paying  agent is The Vanguard  Group,  Inc.,  100  Vanguard  Boulevard,
Malvern, Pennsylvania 19355.

                                       B-1

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CHARACTERISTICS OF THE FUND'S SHARES


     RESTRICTIONS  ON HOLDING OR DISPOSING OF SHARES.  There are no restrictions
on the right of  shareholders  to retain or dispose of the Fund's shares,  other
than the possible future termination of the Fund. The Fund\\ \\may be terminated
by reorganization into another mutual fund or by liquidation and distribution of
its assets.  Unless terminated by  reorganization or liquidation,  the Fund will
continue indefinitely.

     SHAREHOLDER  LIABILITY.  The Fund is organized  under  Delaware law,  which
provides  that  shareholders  of a  business  trust  are  entitled  to the  same
limitations of personal  liability as  shareholders  of a corporation  organized
under Delaware law. Effectively,  this means that a shareholder of the Fund will
not be personally liable for payment of the Fund's debts except by reason of his
or her own conduct or acts. In addition,  a shareholder  could incur a financial
loss on account of a Fund  obligation  only if the Fund itself had no  remaining
assets with which to meet such  obligation.  We believe that the  possibility of
such a situation arising is extremely remote.

     DIVIDEND  RIGHTS.  The shareholders of the Fund are entitled to receive any
dividends or other  distributions  declared by the Fund. No shares have priority
or preference over any other shares with respect to distributions. Distributions
will be made  from the  assets  of the  Fund,  and will be paid  ratably  to all
shareholders according to the number of shares of held by shareholders on the
record date.

     VOTING  RIGHTS.  Shareholders  are  entitled  to vote on a matter if: (i) a
shareholder  vote is required  under the 1940 Act;  (ii) the matter  concerns an
amendment to the Declaration of Trust that would adversely  affect to a material
degree the rights and  preferences  of the shares of any class or fund; or (iii)
the Trustees determine that it is necessary or desirable to obtain a shareholder
vote.  The 1940 Act requires a  shareholder  vote under  various  circumstances,
including to elect or remove  Trustees upon the written  request of shareholders
representing 10% or more of the Fund's net assets, and to change any fundamental
policy of the Fund. Shareholders of the Fund receive one vote for each dollar of
net  asset  value  owned on the  record  date,  and a  fractional  vote for each
fractional dollar of net asset value owned on the record date. Voting rights are
non-cumulative and cannot be modified without a majority vote.

     LIQUIDATION  RIGHTS.  In the  event of  liquidation,  shareholders  will be
entitled to receive a pro rata share of the Fund's net assets.

     PREEMPTIVE  RIGHTS.  There are no  preemptive  rights  associated  with the
Fund's shares.

     CONVERSION  RIGHTS.  There are no  conversion  rights  associated  with the
Fund's shares.

     REDEMPTION  PROVISIONS.  The Fund's redemption  provisions are described in
its  current   prospectus   and  elsewhere  in  this   Statement  of  Additional
Information.

     SINKING FUND PROVISIONS. The Fund has no sinking fund provisions.

     CALLS OR  ASSESSMENT.  The Fund's shares,  when issued,  are fully paid and
non-assessable.


TAX STATUS OF THE FUND

The Fund  intends to continue  to qualify as a  "regulated  investment  company"
under  Subchapter M of the Internal  Revenue Code. This special tax status means
that the Fund will not be liable for  federal  tax on income and  capital  gains
distributed to shareholders.  In order to preserve its tax status, the Fund must
comply with certain  requirements.  If the Fund fails to meet these requirements
in any  taxable  year,  it will  be  subject  to tax on its  taxable  income  at
corporate rates, and all distributions from earnings and profits,  including any
distributions of net tax-exempt  income and net long-term capital gains, will be
taxable to  shareholders  as ordinary  income.  In  addition,  the Fund could be
required to recognize unrealized gains, pay substantial taxes and interest,  and
make  substantial  distributions  before regaining its tax status as a regulated
investment company.

                                       B-2

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                               INVESTMENT POLICIES

The following policies supplement the Fund's investment policies as set forth in
the Prospectus.

     REPURCHASE  AGREEMENTS.  The Fund may invest in repurchase  agreements with
commercial banks, brokers or dealers either for defensive purposes due to market
conditions  or to generate  income from its excess cash  balances.  A repurchase
agreement is an agreement under which the Fund acquires a fixed-income  security
(generally a security  issued by the U.S.  Government  or an agency  thereof,  a
banker's acceptance or a certificate of deposit) from a commercial bank, broker,
or  dealer,  subject  to resale to the  seller at an agreed  upon price and date
(normally,  the next business  day). A repurchase  agreement may be considered a
loan  collateralized  by  securities.  The resale price  reflects an agreed upon
interest rate effective for the period the instrument is held by the Fund and is
unrelated  to  the  interest  rate  on  the  underlying  instrument.   In  these
transactions,  the securities  acquired by the Fund (including  accrued interest
earned thereon) must have a total value in excess of the value of the repurchase
agreement and are held by a custodian bank until repurchased.  In addition,  the
Fund's  Board  of  Trustees  will  monitor  the  Fund's   repurchase   agreement
transactions generally and will establish guidelines and standards for review by
the investment  adviser of the  creditworthiness  of any bank, broker, or dealer
party to a repurchase agreement with the Fund.

     The use of repurchase  agreements  involves certain risks. For example,  if
the other party to the agreement  defaults on its  obligation to repurchase  the
underlying  security at a time when the value of the security has declined,  the
Fund may incur a loss upon  disposition  of the security.  If the other party to
the agreement  becomes  insolvent and subject to liquidation  or  reorganization
under  bankruptcy  or other  laws,  a court may  determine  that the  underlying
security is collateral for a loan by the Fund not within the control of the Fund
and  therefore  the   realization  by  the  Fund  on  such   collateral  may  be
automatically  stayed.  Finally, it is possible that the Fund may not be able to
substantiate  its  interest  in the  underlying  security  and may be  deemed an
unsecured  creditor  of the other  party to the  agreement.  While  the  adviser
acknowledges  these risks,  it is expected that they will be controlled  through
careful monitoring procedures.

     MORTGAGE-BACKED   SECURITIES.   The  Fund  may  invest  in  mortgage-backed
securities.  Mortgage-backed  securities are instruments that entitle the holder
to a share of all interest and principal payments from mortgages  underlying the
security.   The  mortgages   backing  these  securities   include   conventional
thirty-year  fixed rate mortgages,  graduated  payment  mortgages and adjustable
rate  mortgages.  During  periods of declining  interest  rates,  prepayment  of
mortgages underlying  mortgage-backed  securities may be expected to accelerate.
Prepayment of mortgages which underlie  securities  purchased at a premium often
results in capital losses, while prepayment of mortgages purchased at a discount
often  results  in capital  gains.  Because  of these  unpredictable  prepayment
characteristics, it is often not possible to predict accurately the average life
or realized yield of a particular issue.

     COLLATERALIZED  MORTGAGE  OBLIGATIONS.   (CMOs)  are  debt  obligations  or
multi-class pass-through certificates issued by agencies or instrumentalities of
the U.S.  Government,  or by private originators or investors in mortgage loans.
In a CMO,  series  of bonds or  certificates  are  usually  issued  in  multiple
classes,  with  principal  and interest  allocated to each class in a variety of
ways.  Each class of a CMO, or  "tranche,"  is issued  with a specific  fixed or
floating coupon rate and has a stated maturity or final  distribution  date. The
Fund will invest  modestly in those CMO classes  which  feature a high degree of
cash flow predictability and moderate vulnerability to prepayment risk, and that
carry high-quality investment grade credit ratings.

     LENDING  OF  SECURITIES.  The Fund may lend its  investment  securities  to
qualified institutional  investors (typically brokers,  dealers, banks, or other
financial  institutions)  who need to  borrow  securities  in order to  complete
certain transactions, such as covering short sales, avoiding failures to deliver
securities  or  completing  arbitrage  operations.   By  lending  its  portfolio
securities,  the Fund attempts to increase its net investment income through the
receipt of interest on the loan. Any gain

                                       B-3

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or loss in the market price of the securities loaned that might occur during the
term of the loan would be for the account of the Fund. The terms,  the structure
and the aggregate amount of such loans must be consistent with the 1940 Act, and
the rules or  interpretations  of the Commission  thereunder.  These  provisions
limit the amount of securities  the Fund may lend to 33 1/3% of the Fund's total
assets,  and require  that (a) the borrower  pledge and  maintain  with the Fund
collateral  consisting  of cash,  an  irrevocable  letter of credit  issued by a
domestic  U.S.  bank,  or  securities  issued or guaranteed by the United States
Government  having a value at all  times  not less than 100% of the value of the
securities loaned, (b) the borrower add to such collateral whenever the price of
the securities  loaned rises (i.e. the borrower "marks to the market" on a daily
basis), (c) the loan be made subject to termination by the Fund at any time, and
(d) the Fund  receive  reasonable  interest  on the loan  (which may include the
Fund's   investing   any  cash   collateral  in  interest   bearing   short-term
investments),  any  distribution  on the loaned  securities  and any increase in
their  market  value.  Loan  arrangements  made by the Fund will comply with all
other applicable  regulatory  requirements,  including the rules of the New York
Stock Exchange,  which rules presently  require the borrower,  after notice,  to
redeliver the  securities  within the normal  settlement  time of three business
days. All relevant facts and circumstances,  including the  creditworthiness  of
the broker,  dealer or institution,  will be considered in making decisions with
respect to the lending of  securities,  subject to review by the Fund's Board of
Trustees.

     At the  present  time,  the Staff of the  Commission  does not object if an
investment  company pays  reasonable  negotiated  fees in connection with loaned
securities,  so long as such  fees  are set  forth  in a  written  contract  and
approved by the investment company's Trustees.  In addition,  voting rights pass
with the loaned  securities,  but if a material  event will occur  affecting  an
investment on loan, the loan must be called and the securities voted.

     VANGUARD INTERFUND LENDING PROGRAM.  The Commission has issued an exemptive
order  permitting the Fund and other Vanguard funds to participate in Vanguard's
interfund  lending  program.  This program  allows the Vanguard  funds to borrow
money from and loan money to each other for temporary or emergency purposes. The
program is subject to a number of conditions,  including the requirement that no
fund may borrow or lend money  through  the  program  unless it  receives a more
favorable  interest rate than is available  from a typical bank for a comparable
transaction. In addition, a Vanguard fund may participate in the program only if
and to the  extent  that  such  participation  is  consistent  with  the  fund's
investment  objective and other investment  policies.  The Boards of Trustees of
the Vanguard  funds are  responsible  for ensuring  that the  interfund  lending
program operates in compliance with all conditions of the Commission's exemptive
order.

     TEMPORARY INVESTMENTS.  The Fund may take temporary defensive measures that
are  inconsistent  with  the  Fund's  normal   fundamental  or   non-fundamental
investment  policies and  strategies  in response to adverse  market,  economic,
political or other  conditions.  Such measures could include  investments in (a)
highly  liquid  short-term  fixed-income  securities  issued  by or on behalf of
municipal or  corporate  issuers,  obligations  of the U.S.  Government  and its
agencies,  commercial  paper,  and bank  certificates of deposit;  (b) shares of
other  investment  companies  which have investment  objectives  consistent with
those of the Fund; (c) repurchase agreements involving any such securities;  and
(d) other money market instruments. There is no limit on the extent to which the
Fund may take temporary  defensive measures.  In taking such measures,  the Fund
may fail to achieve its investment objective.

     FOREIGN INVESTMENTS. Vanguard Wellesley Income Fund may invest up to 20% of
its equity  assets in foreign  common  stocks and  securities  convertible  into
foreign  stocks.  The Fund may  also  invest  in U.S.  dollar  denominated  debt
securities issued by foreign governments,  their agencies and instrumentalities,
supranational  entities and companies  located  outside the U.S.  without limit.
Investors should recognize that investing in foreign companies  involves certain
special considerations which are not typically associated with investing in U.S.
companies. Among these risks are the following:

                                       B-4

<PAGE>

     Country  Risk. As foreign  companies  are not generally  subject to uniform
accounting,  auditing and financial reporting standards and practices comparable
to those applicable to domestic companies,  there may be less publicly available
information  about certain  foreign  companies  than about  domestic  companies.
Securities of some foreign companies are generally less liquid and more volatile
than  securities  of  comparable  domestic  companies.  There is generally  less
government  supervision and regulation of foreign stock  exchanges,  brokers and
listed  companies than in the U.S. In addition,  with respect to certain foreign
countries,  there is the possibility of expropriation or confiscatory  taxation,
political or social instability,  or diplomatic  developments which could affect
U.S. investments in those countries.

     Although  the Fund will  endeavor to achieve the most  favorable  execution
costs in its portfolio transactions in foreign securities,  fixed commissions on
many foreign stock exchanges are generally higher than negotiated commissions on
U.S.  exchanges.  In addition,  it is expected  that the expenses for  custodial
arrangements of the Fund's foreign  securities will be somewhat greater than the
expenses for the custodian  arrangement  for handling  U.S.  securities of equal
value.

     Certain foreign  governments  levy  withholding  taxes against dividend and
interest  income.  Although  in some  countries  a  portion  of  these  taxes is
recoverable,  the non-recovered portion of foreign withholding taxes will reduce
the income the Fund receives from its foreign investments.

     Currency  Risk.  Since  the  stocks of  foreign  companies  are  frequently
denominated  in  foreign  currencies,  and since the Fund may  temporarily  hold
uninvested  reserves in bank  deposits in foreign  currencies,  the Fund will be
affected  favorably or  unfavorably by changes in currency rates and in exchange
control regulations,  and may incur costs in connection with conversions between
various currencies.  The investment policies of the Fund permit it to enter into
forward  foreign  currency  exchange  contracts  in order to hedge  holdings and
commitments  against  changes  in the  level  of  future  currency  rates.  Such
contracts  involve an  obligation  to purchase or sell a specific  currency at a
future date at a price set at the time of the contract.

     FEDERAL TAX  TREATMENT OF NON-U.S.  TRANSACTIONS.  Special rules govern the
Federal income tax treatment of certain  transactions  denominated in terms of a
currency  other than the U.S.  dollar or determined by reference to the value of
one or more  currencies  other than the U.S.  dollar.  The types of transactions
covered by the special rules include the following:  (i) the  acquisition of, or
becoming the obligor under, a bond or other debt instrument  (including,  to the
extent provided in Treasury regulations,  preferred stock); (ii) the accruing of
certain  trade  receivables  and  payables;  and  (iii)  the  entering  into  or
acquisition  of any  forward  contract,  futures  contract,  option  or  similar
financial instrument if such instrument is not marked to market. The disposition
of a currency other than the U.S. dollar by a taxpayer whose functional currency
is the U.S.  dollar is also  treated as a  transaction  subject  to the  special
currency rules. However,  foreign  currency-related  regulated futures contracts
and nonequity options are generally not subject to the special currency rules if
they are or would be  treated as sold for their fair  market  value at  year-end
under the  marking-to-market  rules applicable to other futures contracts unless
an  election  is made  to have  such  currency  rules  apply.  With  respect  to
transactions  covered by the special  rules,  foreign  currency  gain or loss is
calculated separately from any gain or loss on the underlying transaction and is
normally  taxable as ordinary  income or loss.  A taxpayer may elect to treat as
capital  gain or  loss  foreign  currency  gain or  loss  arising  from  certain
identified  forward  contracts,  futures  contracts and options that are capital
assets in the hands of the  taxpayer  and which are not part of a straddle.  The
Treasury Department issued regulations under which certain  transactions subject
to  the  special  currency  rules  that  are  part  of a  "section  988  hedging
transaction" (as defined in the Internal  Revenue Code of 1986, as amended,  and
the Treasury regulations) will be integrated and treated as a single transaction
or otherwise  treated  consistently  for purposes of the Code.  Any gain or loss
attributable to the foreign currency component of a transaction  engaged in by a
fund which is not subject to the special  currency rules (such as foreign equity
investments other than certain preferred stocks) will be treated as capital gain
or loss  and  will not be  segregated  from  the gain or loss on the  underlying
transaction. It is anticipated that some of the non-U.S. dollar-denominated

                                       B-5

<PAGE>

investments and foreign currency  contracts the Fund may make or enter into will
be subject to the special currency rules described above.

     ILLIQUID  SECURITIES.  The Fund may  invest up to 15% of its net  assets in
illiquid securities.  Illiquid securities are securities that may not be sold or
disposed of in the ordinary  course of business  within seven  business  days at
approximately the value at which they are being carried on the Fund's books.

     The Fund may invest in restricted,  privately placed securities that, under
securities  laws, may be sold only to qualified  institutional  buyers.  Because
these securities can be resold only to qualified  institutional  buyers or after
they  have been held for a number  of  years,  they may be  considered  illiquid
securities--meaning that they could be difficult for the Fund to convert to cash
if needed.

     If a  substantial  market  develops for a restricted  security  held by the
Fund, it will be treated as a liquid security, in accordance with procedures and
guidelines  approved by the Fund's Board of Trustees.  This  generally  includes
securities  that are  unregistered  that can be sold to qualified  institutional
buyers in accordance with Rule 144A under the Securities Act of 1933.  While the
Fund's investment adviser determines the liquidity of restricted securities on a
daily basis,  the Board  oversees and retains  ultimate  responsibility  for the
adviser's  decisions.  Several  factors that the Board  considers in  monitoring
these  decisions  include the  valuation  of a  security,  the  availability  of
qualified  institutional  buyers,  and the availability of information about the
security's issuer.

     FUTURES CONTRACTS AND OPTIONS.  The Fund may enter into futures  contracts,
options,  and options on futures  contracts for the purpose of  simulating  full
investment and reducing  transactions  costs.  Futures contracts provide for the
future sale by one party and purchase by another party of a specified  amount of
a specific security at a specified future time and at a specified price. Futures
contracts which are  standardized  as to maturity date and underlying  financial
instrument  are traded on national  futures  exchanges.  Futures  exchanges  and
trading are regulated under the Commodity  Exchange Act by the Commodity Futures
Trading Commission (CFTC), a U.S. Government Agency. Assets committed to futures
contracts will be segregated to the extent required by law.

     Although  futures  contracts  by their  terms call for actual  delivery  or
acceptance of the underlying securities,  in most cases the contracts are closed
out before the settlement date without the making or taking of delivery. Closing
out an open futures position is done by taking an opposite position  ("buying" a
contract  which has previously  been "sold," or "selling" a contract  previously
purchased)  in an  identical  contract  to  terminate  the  position.  Brokerage
commissions are incurred when a futures contract is bought or sold.

     Futures traders are required to make a good faith margin deposit in cash or
government  securities  with a broker or custodian to initiate and maintain open
positions  in  futures  contracts.  A  margin  deposit  is  intended  to  assure
completion of the contract  (delivery or acceptance of the underlying  security)
if it is not terminated  prior to the specified  delivery date.  Minimal initial
margin  requirements are established by the futures exchange and may be changed.
Brokers may establish  deposit  requirements  which are higher than the exchange
minimums.  Futures contracts are customarily  purchased and sold on margin which
may range upward from less than 5% of the value of the contract being traded.

     After a futures contract  position is opened,  the value of the contract is
marked to market daily. If the futures contract price changes to the extent that
the  margin  on  deposit  does  not  satisfy  margin  requirements,  payment  of
additional  "variation"  margin  will be  required.  Conversely,  change  in the
contract  value may reduce the  required  margin,  resulting  in a repayment  of
excess margin to the contract holder.  Variation margin payments are made to and
from the  futures  broker for as long as the  contract  remains  open.  The Fund
expects to earn interest income on its margin deposits.

     Traders in futures contracts may be broadly  classified as either "hedgers"
or   "speculators."   Hedgers  use  the  futures  markets  primarily  to  offset
unfavorable  changes in the value of securities  otherwise  held for  investment
purposes or expected to be acquired by them. Speculators are less

                                       B-6

<PAGE>

inclined  to own the  securities  underlying  the futures  contracts  which they
trade, and use futures  contracts with the expectation of realizing profits from
fluctuations  in the prices of  underlying  securities.  The Fund intends to use
futures contracts only for bona fide hedging purposes.

     Regulations  of the CFTC  applicable  to the Fund  require  that all of its
futures  transactions  constitute bona fide hedging  transactions  except to the
extent that the aggregate initial margins and premiums required to establish any
non-hedging  positions  do not  exceed  five  percent of the value of the Fund's
portfolio.  The Fund will only sell futures  contracts to protect  securities it
owns against price declines or purchase contracts to protect against an increase
in the price of securities  it intends to purchase.  As evidence of this hedging
interest,  the Fund  expects  that  approximately  75% of its  futures  contract
purchases will be "completed," that is, equivalent amounts of related securities
will have been  purchased  or are being  purchased by the Fund upon sale of open
futures contracts.

     Although  techniques other than the sale and purchase of futures  contracts
could be used to control the Fund's exposure to market fluctuations,  the use of
futures contracts may be a more effective means of hedging this exposure.  While
the Fund will incur commission  expenses in both opening and closing out futures
positions, these costs are lower than transaction costs incurred in the purchase
and sale of the underlying securities.

     Restrictions  on the Use of Futures  Contracts The Fund will not enter into
futures contract transactions to the extent that,  immediately  thereafter,  the
sum of its initial margin  deposits on open  contracts  exceeds 5% of the market
value of the Fund's  total  assets.  In  addition,  the Fund will not enter into
futures  contracts to the extent that its  outstanding  obligations  to purchase
securities under these contracts would exceed 20% of the Fund's total assets.

     Risk Factors in Futures Transactions  Positions in futures contracts may be
closed  out only on an  exchange  which  provides  a  secondary  market for such
futures.  However, there can be no assurance that a liquid secondary market will
exist for any particular futures contract at any specific time. Thus, it may not
be  possible  to  close a  futures  position.  In the  event  of  adverse  price
movements, the Fund would continue to be required to make daily cash payments to
maintain its required margin.  In such situations,  if the Fund has insufficient
cash, it may have to sell portfolio securities to meet daily margin requirements
at a time when it may be disadvantageous to do so. In addition,  the Fund may be
required to make delivery of the  instruments  underlying  futures  contracts it
holds.  The inability to close options and futures  positions also could have an
adverse impact on the ability to effectively hedge it.

     The Fund  will  minimize  the risk  that it will be  unable  to close out a
futures  contract by only  entering  into  futures  which are traded on national
futures exchanges and for which there appears to be a liquid secondary market.

     The risk of loss in trading  futures  contracts in some  strategies  can be
substantial,  due both to the low margin  deposits  required,  and the extremely
high degree of leverage  involved in futures pricing.  As a result, a relatively
small  price  movement  in a  futures  contract  may  result  in  immediate  and
substantial loss (as well as gain) to the investor.  For example, if at the time
of purchase,  10% of the value of the futures contract is deposited as margin, a
subsequent  10% decrease in the value of the futures  contract would result in a
total  loss of the margin  deposit,  before any  deduction  for the  transaction
costs,  if the account  were then closed out. A 15%  decrease  would result in a
loss equal to 150% of the original  margin  deposit if the contract  were closed
out.  Thus,  a purchase  or sale of a futures  contract  may result in losses in
excess of the amount invested in the contract. The Fund also bears the risk that
the adviser will incorrectly predict market trends. However, because the futures
strategies  of the Fund are  engaged in only for hedging  purposes,  the adviser
does not believe  that the Fund will be subject to the risks of loss  frequently
associated with futures  transactions.  The Fund would presumably have sustained
comparable  losses if, instead of the futures  contract,  it had invested in the
underlying financial instrument and sold it after the decline.

     Utilization  of futures  transactions  by the Fund does involve the risk of
imperfect or no correlation  where the securities  underlying  futures contracts
have different maturities than the

                                       B-7

<PAGE>

portfolio  securities being hedged. It is also possible that the Fund could both
lose money on futures  contracts  and also  experience a decline in value of its
portfolio  securities.  There is also  the  risk of loss by the  Fund of  margin
deposits in the event of  bankruptcy  of a broker with whom the Fund has an open
position in a futures contract or related option.  Additionally,  investments in
futures contracts and options involve the risk that the adviser will incorrectly
predict stock market and interest rate trends.

     Most futures exchanges limit the amount of fluctuation permitted in futures
contract  prices during a single  trading day. The daily limit  establishes  the
maximum  amount that the price of a futures  contract may vary either up or down
from the previous day's settlement  price at the end of a trading session.  Once
the daily limit has been reached in a particular type of contract, no trades may
be made on that day at a price beyond that limit.  The daily limit  governs only
price  movement  during a particular  trading day and  therefore  does not limit
potential  losses,  because the limit may prevent the liquidation of unfavorable
positions.  Futures contract prices have  occasionally  moved to the daily limit
for  several  consecutive  trading  days  with  little  or no  trading,  thereby
preventing  prompt  liquidation of future  positions and subjecting some futures
traders to substantial losses.

     FEDERAL  TAX  TREATMENT  OF FUTURES  CONTRACTS.  The Fund is  required  for
federal income tax purposes to recognize as income for each taxable year its net
unrealized  gains and losses on certain futures  contracts held as of the end of
the year as well as those actually realized during the year. In these cases, any
gain or loss recognized  with respect to a futures  contract is considered to be
60%  long-term  capital  gain or loss and 40%  short-term  capital gain or loss,
without  regard to the  holding  period  of the  contract.  Gains and  losses on
certain other futures contracts  (primarily non-U.S.  futures contracts) are not
recognized  until the  contracts  are closed and are  treated  as  long-term  or
short-term  depending on the holding  period of the  contract.  Sales of futures
contracts  which  are  intended  to  hedge  against  a  change  in the  value of
securities  held by the Fund may affect the  holding  period of such  securities
and,  consequently,  the  nature  of the  gain or loss on such  securities  upon
disposition.  The Fund may be  required  to defer the  recognition  of losses on
futures  contracts to the extent of any unrecognized  gains on related positions
held by the Fund.

     In order  for the Fund to  continue  to  qualify  for  federal  income  tax
treatment as a regulated  investment  company,  at least 90% of its gross income
for a taxable  year must be derived from  qualifying  income;  i.e.,  dividends,
interest,  income  derived  from  loans of  securities,  gains  from the sale of
securities or of foreign currencies, or other income derived with respect to the
Fund's business of investing in securities or currencies. It is anticipated that
any net gain  recognized  on futures  contracts  will be  considered  qualifying
income for purposes of the 90% requirement.

     The Fund will  distribute  to  shareholders  annually any net capital gains
which  have  been   recognized  for  federal  income  tax  purposes  on  futures
transactions.  Such distributions will be combined with distributions of capital
gains realized on the Fund's other  investments and shareholders will be advised
on the nature of the distributions.


INVESTMENT  POLICIES  RELATING  TO THE  SALE  OF  INVESTOR  SHARES  OF  VANGUARD
WELLESLEY INCOME FUND IN JAPAN


In  connection  with the  offering of the Fund's  Shares in Japan,  the Fund has
undertaken to the Japanese Securities Dealers Association that the Fund may not:


1.   Borrow money,  except for temporary or emergency  purposes in an amount not
     exceeding 10% of the Fund's net assets;

2.   Together  with other mutual  funds  managed by The  Vanguard  Group,  Inc.,
     acquire more than 50% of the outstanding voting securities of any issuer;

3.   Invest  more  than 15% of its net  assets  in  illiquid  securities  (which
     include securities restricted as to resale unless they are determined to be
     readily  marketable in accordance with procedures  established by the Board
     of Trustees); and

4.   Sell securities short at any time in excess of its net asset value.


                                       B-8

<PAGE>

     If the undertaking is violated,  the Fund will,  promptly after  discovery,
take such action as may be  necessary  to cause the  violation  to cease,  which
shall be the only  obligation  of the Fund and the only remedy in respect of the
violation.  This  undertaking will remain in effect as long as (i) shares of the
Fund  are  qualified  for  offer or sale in Japan  and (ii) the  undertaking  is
required by the "Standards of Selection of Foreign  Investment Fund  Securities"
established under the Rules of Foreign  Securities  Transactions by the Japanese
Securities Dealers Association.


                       FUNDAMENTAL INVESTMENT LIMITATIONS

The Fund is subject to the following fundamental investment  limitations,  which
cannot be changed in any  material  way without the approval of the holders of a
majority of the Fund's shares. For these purposes,  a "majority" of shares means
shares  representing the lesser of: (i) 67% or more of the votes cast to approve
a change,  so long as shares  representing more than 50% of the Fund's net asset
value are present or represented  by proxy;  or (ii) more than 50% of the Fund's
net asset value.

     BORROWING. The Fund may not borrow money, except for temporary or emergency
purposes in an amount not exceeding  15% of the Fund's net assets.  The Fund may
borrow  money  through  banks,  reverse  repurchase  agreements,  or  Vanguard's
interfund  lending program only, and must comply with all applicable  regulatory
conditions.  The  Fund  may not make any  additional  investments  whenever  its
outstanding borrowings exceed 5% of net assets.

     COMMODITIES. The Fund may not invest in commodities. The Fund may invest in
futures contracts on securities and indexes. The Fund may also invest in options
on futures and options on securities and indexes.  No more than 5% of the Fund's
assets may be used as initial margin  deposit and premium for futures  contracts
and options,  and the notional amount of futures contracts may not exceed 20% of
the Fund's assets at any time.

     DIVERSIFICATION. With respect to 75% of its total assets, the Fund may not:
(i)  purchase  more than 10% of the  outstanding  voting  securities  of any one
issuer, or (ii) purchase  securities of any issuer if, as a result, more than 5%
of the Fund's total assets would be invested in that issuer's  securities.  This
limitation  does not apply to obligations of the United States  Government,  its
agencies, or instrumentalities.

     ILLIQUID OR  RESTRICTED  SECURITIES.  The Fund may not acquire any security
if, as a result, more than 15% of its net assets would be invested in securities
that are illiquid.

     INDUSTRY CONCENTRATION.  The Fund may not invest more than 25% of its total
assets in any one industry. Utility companies will be divided according to their
services;  for example, gas, gas transmission,  electric and gas, electric,  and
telephone will each be considered a separate industry;

     INVESTING FOR CONTROL. The Fund may not invest in a company for the purpose
of controlling its management.

     INVESTMENT  COMPANIES.  The Fund may not  invest  in any  other  investment
company, except through a merger,  consolidation or acquisition of assets, or to
the extent permitted by Section 12 of the 1940 Act.  Investment  companies whose
shares the Fund acquires pursuant to Section 12 must have investment  objectives
and investment policies consistent with those of the Fund.

     LOANS.  The Fund may not lend  money to any  person  except  by  purchasing
fixed-income  securities that are publicly distributed or customarily  purchased
by  institutional  investors or by entering into  repurchase  agreements,  or by
lending its portfolio securities.

     MARGIN.  The Fund may not purchase  securities on margin or sell securities
short,  except as  permitted  by the  Fund's  investment  policies  relating  to
commodities.

     PLEDGING ASSETS. The Fund may not pledge, mortgage or hypothecate more than
15% of its net assets.

     REAL ESTATE.  The Fund may not invest directly in real estate,  although it
may invest in  securities  of companies  that deal in real estate,  or interests
therein.

                                       B-9

<PAGE>

     SENIOR  SECURITIES.  The Fund may not issue  senior  securities,  except in
compliance with the 1940 Act.

     UNDERWRITING.  The Fund may not  engage  in the  business  of  underwriting
securities  issued  by  other  persons.  The  Fund  will  not be  considered  an
underwriter when disposing of its investment securities.

     The  investment  limitations  set forth  above are  considered  at the time
investment securities are purchased.  If a percentage  restriction is adhered to
at the time the  investment is made, a later  increase in  percentage  resulting
from a change in the market  value of assets will not  constitute a violation of
such restriction.

     None of these  limitations  prevents  the Fund  from  participating  in The
Vanguard Group, Inc. (Vanguard). As a member of The Vanguard Group of Investment
Companies,  the  Fund may own  securities  issued  by  Vanguard,  make  loans to
Vanguard,  and contribute to Vanguard's  costs or other financial  requirements.
See "Management of the Fund" for more information.

                                   SHARE PRICE

The Fund's  share  price,  or "net asset  value" per  share,  is  calculated  by
dividing the total assets of the Fund, less all liabilities, by the total number
of shares outstanding.  The net asset value is determined as of the close of the
New York Stock Exchange,  generally 4:00 p.m. Eastern time, on each day that the
Exchange is open for trading.

     Portfolio  securities  for which market  quotations  are readily  available
(includes those securities listed on national securities  exchanges,  as well as
those quoted on the NASDAQ Stock Market) will be valued at the last quoted sales
price on the day the valuation is made. Such securities  which are not traded on
the  valuation  date are  valued  at the mean of the bid and ask  prices.  Price
information on  exchange-listed  securities is taken from the exchange where the
security is primarily  traded.  Securities may be valued on the basis of prices,
provided by a pricing  service when such prices are believed to reflect the fair
market value of such securities.

     Short term instruments (those with remaining maturities of 60 days or less)
may be valued at cost,  plus or minus any amortized  discount or premium,  which
approximates market value.

     Bonds  and  other  fixed-income  securities  may be  valued on the basis of
prices  provided by a pricing  service  when such prices are believed to reflect
the fair  market  value of such  securities.  The prices  provided  by a pricing
service  may be  determined  without  regard to bid or last sale  prices of each
security,  but take into  account  institutional-size  transactions  in  similar
groups of securities as well as any developments related to specific securities.

     Foreign securities are valued at the last quoted sales price,  according to
the broadest and most representative  market,  available at the time the Fund is
valued.  If events which materially  affect the value of the Fund's  investments
occur after the close of the  securities  markets on which such  securities  are
primarily  traded,  those investments may be valued by such methods as the Board
of Trustees deems in good faith to reflect fair value.

     In  determining  the  Fund's  net asset  value per  share,  all  assets and
liabilities  initially  expressed in foreign  currencies  will be converted into
U.S.  dollars using the  officially  quoted daily  exchange rates used by Morgan
Stanley Capital  International in calculating various benchmarking indexes. This
officially quoted exchange rate may be determined prior to or after the close of
a particular  securities market. If such quotations are not available,  the rate
of exchange will be determined in accordance  with policies  established in good
faith by the Board of Trustees.

     Other assets and securities  for which no quotations are readily  available
or which are restricted as to sale (or resale) are valued by such methods as the
Board of Trustees deems in good faith to reflect fair value.

     The share price for the Fund can be found daily in the mutual fund listings
of most major newspapers under the heading of Vanguard Funds.

                                      B-10

<PAGE>

                               PURCHASE OF SHARES

The Fund reserves the right in its sole  discretion (i) to suspend the offerings
of its shares,  (ii) to reject purchase or exchange  purchase orders when in the
judgment of management  such  rejection is in the best interest of the Fund, and
(iii) to reduce or waive the minimum for any other  restrictions  on initial and
subsequent  investments for certain  fiduciary  accounts or under  circumstances
where certain economies can be achieved in sales of the Fund's shares.

TRADING SHARES THROUGH CHARLES SCHWAB

The Fund has  authorized  Charles  Schwab & Co., Inc.  (Schwab) to accept on its
behalf purchase and redemption orders under certain terms and conditions. Schwab
is also  authorized to designate  other  intermediaries  to accept  purchase and
redemption  orders on the Fund's behalf  subject to those terms and  conditions.
Under this  arrangement,  the Fund will be deemed to have received a purchase or
redemption order when Schwab or, if applicable,  Schwab's  authorized  designee,
accepts the order in accordance  with the Fund's  instructions.  Customer orders
that are properly transmitted to the Fund by Schwab, or if applicable,  Schwab's
authorized designee, will be priced as follows:

     Orders  received by Schwab before 3 p.m.  Eastern time on any business day,
will be sent to  Vanguard  that day and your  share  price  will be based on the
Fund's  net asset  value  calculated  at the close of trading  that day.  Orders
received by Schwab after 3 p.m.  Eastern  time,  will be sent to Vanguard on the
following  business  day and your  share  price  will be based on the Fund's net
asset value calculated at the close of trading that day.

                              REDEMPTION OF SHARES

The Fund may suspend  redemption  privileges or postpone the date of payment (i)
during any period  that the  Exchange is closed,  or trading on the  Exchange is
restricted  as  determined  by the  Commission,  (ii)  during any period when an
emergency  exists as  defined by the  Commission  as a result of which it is not
reasonably  practicable  for the Fund to dispose of  securities  owned by it, or
fairly to determine the value of its assets, and (iii) for such other periods as
the Commission may permit.

     The Fund  has  made an  election  with  the  Commission  to pay in cash all
redemptions  requested by any shareholder of record limited in amount during any
90-day  period to the lesser of  $250,000 or 1% of the net assets of the Fund at
the beginning of such period.

     No charge is made by the Fund for redemptions. Shares redeemed may be worth
more or less than what was paid for them,  depending  on the market value of the
securities held by the Fund.

                             YIELD AND TOTAL RETURN

     The yield of the Fund for the 30-day  period  ended  December  31, 1999 was
5.73%.  The average  annual  total return of the Fund for the one-,  five-,  and
ten-year  periods  ended  December  31,  1999 was  -4.14%,  12.69%,  and 10.56%,
respectively.

SEC YIELD

Yield is the net  annualized  yield  based on a  specific  30-day (or one month)
period  assuming  semiannual  compounding  of  income.  Yield is  calculated  by
dividing the net  investment  income per share  earned  during the period by the
maximum offering price per share on the last day of the period, according to the
following formula:

                                      B-11

<PAGE>

                           YIELD = 2[((A-B)CD+1)6 - 1]

  Where:

          a =  dividends  and  interest  earned  during  the period
          b =  expenses accrued for the period (net of  reimbursements)
          c =  the average daily number of shares outstanding during
               the period that were entitled to receive dividends
          d =  the maximum offering price per share on the last day of
               the period

AVERAGE ANNUAL TOTAL RETURN

Average annual total return is the average annual  compounded rate of return for
the periods of one year, five years, and ten years, all ended on the last day of
a recent month.  Average annual total return  quotations will reflect changes in
the price of the Fund's  shares and assume that all  dividends and capital gains
distributions during the respective periods were reinvested in Fund shares.

     Average  annual total return is  calculated  by finding the average  annual
compounded  rates of  return of a  hypothetical  investment  over  such  periods
according  to the  following  formula  (average  annual  total  return  is  then
expressed as a percentage):

                               T = (ERV/P)1/N - 1

  Where:

          T =  average annual total return
          P =  a hypothetical  initial investment of $1,000
          n =  number of years
          ERV =ending  redeemable  value:  ERV is the value, at the end
               of the applicable period, of a hypothetical $1,000
               investment made at the beginning of the applicable
               period

AVERAGE ANNUAL AFTER-TAX TOTAL RETURN QUOTATION

We calculate the Fund's  average  annual  after-tax  total return by finding the
average annual  compounded  rate of return over the 1-, 5-, and 10-year  periods
that would equate the initial amount invested to the after-tax value,  according
to the following formulas:

                                 P (1+T) N = ATV

  Where:

          P =  a hypothetical  initial  payment  of  $1,000
          T =  average  annual after-tax  total  return
          n =  number of years
        ATV =  after-tax  value at the end of the 1-, 5-, or 10-year
               periods of a hypothetical $1,000 payment made at the beginning of
               the time period, assuming no liquidation of the investment at the
               end of the measurement periods.

Instructions.

1.   Assume all distributions by the Fund are  reinvested--less the taxes due on
     such  distributions--at  the price on the  reinvestment  dates  during  the
     period.  Adjustments  may be made for  subsequent  re-characterizations  of
     distributions.

2.   Calculate  the  taxes  due on  distributions  by the Fund by  applying  the
     highest federal  marginal tax rates to each component of the  distributions
     on the reinvestment date (e.g.,  ordinary income,  short-term capital gain,
     long-term  capital gain,  etc.).  For periods after  December 31, 1997, the
     federal marginal tax rates used for the calculations are 39.6% for ordinary
     income and  short-term  capital gains and 20% for long-term  capital gains.
     Note that the  applicable tax rates may vary over the  measurement  period.
     Assume no taxes are due on the portions of any

                                      B-12

<PAGE>

     distributions classified as exempt interest or non-taxable (i.e., return of
     capital).  Ignore any  potential  tax  liabilities  other than  federal tax
     liabilities (e.g., state and local taxes).

3.   Include all recurring  fees that are charged to all  shareholder  accounts.
     For any  account  fees that vary  with the size of the  account,  assume an
     account size equal to the Fund's mean (or median) account size. Assume that
     no  additional  taxes or tax credits  result from any  redemption of shares
     required to pay such fees.

4.   State the total return quotation to the nearest hundredth of one percent.


CUMULATIVE TOTAL RETURN

     Cumulative  total return is the cumulative rate of return on a hypothetical
     initial  investment  of $1,000 for a  specified  period.  Cumulative  total
     return  quotations  reflect  changes in the price of the Fund's  shares and
     assume that all dividends and capital gains distributions during the period
     were  reinvested in Fund shares.  Cumulative  total return is calculated by
     finding the cumulative rates of a return of a hypothetical  investment over
     such periods,  according to the following formula  (cumulative total return
     is then expressed as a percentage):

                                 C = (ERV/P) - 1

  Where:

          C  = cumulative total return.
          P  = a hypothetical initial investment of $1,000.
        ERV  = ending redeemable value: ERV is the value, at the end
               of the applicable period, of a hypothetical $1,000
               investment made at the beginning of the applicable
               period.

                             MANAGEMENT OF THE FUND

OFFICERS AND TRUSTEES

The officers of the Fund manage its day-to-day operations and are responsible to
the Fund's Board of Trustees.  The Trustees set broad  policies for the Fund and
choose its officers. The following is a list of the Trustees and officers of the
Fund and a statement of their present positions and principal occupations during
the past five years. As a group,  the Fund's Trustees and officers own less than
1% of the outstanding shares of the Fund. Each Trustee also serves as a Director
of The Vanguard Group,  Inc., and as a Trustee of each of the funds administered
by  Vanguard.  The mailing  address of the  Trustees and officers of the Fund is
Post Office Box 876, Valley Forge, PA 19482.

JOHN J. BRENNAN, (DOB: 7/29/1954)Chairman, Chief Executive Officer, and Trustee*
Chairman,  Chief Executive Officer and Director of The Vanguard Group, Inc., and
Trustee of each of the investment companies in The Vanguard Group.

JOANN HEFFERNAN HEISEN, (DOB: 1/25/1950) Trustee
Vice President, Chief Information Officer, and member of the Executive Committee
of Johnson and Johnson (Pharmaceuticals/Consumer  Products), Director of Johnson
& Johnson*MERCK  Consumer  Pharmaceuticals Co., The Medical Center at Princeton,
and Women's Research and Education Institute.

BRUCE K. MACLAURY, (DOB: 5/7/1931) Trustee
President  Emeritus  of  The  Brookings  Institution  (Independent  Non-Partisan
Research  Organization);  Director of American  Express Bank, Ltd., The St. Paul
Companies, Inc. (Insurance and Financial Services), and National Steel Corp.


BURTON G. MALKIEL, (DOB: 8/28/1932) Trustee
Chemical Bank Chairman's Professor of Economics, Princeton University;  Director
of Prudential  Insurance Co. of America,  Banco Bilbao Argentaria,  Gestion, BKF
Capital (Investment Management), The Jeffrey Co. (Holding Company), NeuVis, Inc.
(Software Co.), and Select Sector SPDR Trust (Exchange-Traded Mutual Fund).


                                      B-13

<PAGE>

ALFRED M. RANKIN, JR., (DOB: 10/8/1941) Trustee
Chairman,  President, Chief Executive Officer, and Director of NACCO Industries,
Inc. (Machinery/ Coal/Appliances);  and Director of The BFGoodrich Co. (Aircraft
Systems/Manufacturing/Chemicals),.

JOHN C. SAWHILL, (DOB: 6/12/1936) Trustee
President  and Chief  Executive  Officer of The Nature  Conservancy  (Non-Profit
Conservation Group);  Director of Pacific Gas and Electric Co., Procter & Gamble
Co.,  NACCO  Industries,   Inc.  (Machinery/   Coal/Appliances),   and  Newfield
Exploration Co.  (Energy);  formerly,  Director and Senior Partner of McKinsey &
Co., and President of New York University.

JAMES O. WELCH, JR., (DOB: 5/13/1931) Trustee
Retired Chairman of Nabisco Brands, Inc. (Food Products);  retired Vice Chairman
and  Director  of RJR  Nabisco  (Food and  Tobacco  Products);  Director of TECO
Energy, Inc., and Kmart Corp.


J. LAWRENCE WILSON, (DOB: 3/2/1936) Trustee
Retired  Chairman  and CEO of Rohm & Haas Co.  (Chemicals);  Director of Cummins
Engine Co. (Diesel Engines),  The Mead Corp.  (Paper Products);  and AmeriSource
Health  Corp.   (Pharmaceutical   Distribution);   and  Trustee  of   Vanderbilt
University.


RAYMOND J. KLAPINSKY, (DOB:12/7/1938) Secretary*
Managing Director of The Vanguard Group, Inc.;  Secretary of The Vanguard Group,
Inc. and of each of the investment companies in The Vanguard Group.

THOMAS J. HIGGINS, (DOB: 5/21/1957) Treasurer*
Principal  of The Vanguard  Group,  Inc.;  Treasurer  of each of the  investment
companies in The Vanguard Group.

ROBERT D. SNOWDEN, (DOB: 9/4/1961) Controller*
Principal of The Vanguard  Group,  Inc.;  Controller  of each of the  investment
companies in The Vanguard Group.

*Officers of the Fund are "interested persons" as defined in the 1940 Act.

THE VANGUARD GROUP

Vanguard  Wellesley  Income Fund is a member of The Vanguard Group of Investment
Companies  which  consists of more than 100 funds.  Through their  jointly-owned
subsidiary,  The  Vanguard  Group,  Inc.,  the Fund,  and the other funds in The
Vanguard  Group  obtain at cost  virtually  all of their  corporate  management,
administrative  and  distribution  services.  Vanguard also provides  investment
advisory services on an at-cost basis to certain of the Vanguard funds.

     Vanguard  employs  a  supporting  staff of  management  and  administrative
personnel  needed  to  provide  the  requisite  services  to the  funds and also
furnishes the funds with necessary office space, furnishings and equipment. Each
fund pays its share of Vanguard's  total expenses which are allocated  among the
funds under methods approved by the Board of Trustees of each fund. In addition,
each fund bears its own direct expenses such as legal,  auditing,  and custodian
fees.

     The Fund's officers are also officers and employees of Vanguard. No officer
or employee owns, or is permitted to own, any securities of any external adviser
for the funds.

     Vanguard and the Fund's  adviser have adopted  Codes of Ethics  designed to
prevent employees who may have access to nonpublic information about the trading
activities of the Fund (access  persons) from profiting  from that  information.
The Codes permit access  persons to invest in securities for their own accounts,
including  securities  that may be held by the Fund, but place  substantive  and
procedural  restrictions  on their trading  activities.  For example,  the Codes
require that access persons receive advance  approval for every securities trade
to ensure that there is no conflict with the trading activities of the Fund.

                                      B-14

<PAGE>

     Vanguard was  established  and operates  under Amended and Restated  Funds'
Service  Agreement which was approved by the  shareholders of each of the funds.
The amounts which each of the funds have invested are adjusted from time to time
in order to maintain the proportionate relationship between each fund's relative
net assets and its contribution to Vanguard's capital.  The Amended and Restated
Funds' Service Agreement  provides that each Vanguard fund may be called upon to
invest up to 0.40% of its current net assets in  Vanguard  as  contributions  to
Vanguard's capitalization.  At December 31, 1999, Vanguard Wellesley Income Fund
had  contributed  capital of $1,500,000 to Vanguard,  representing  0.02% of the
Fund's net assets and 1.5% of Vanguard's capitalization.

     MANAGEMENT.  Corporate management and administrative  services include: (1)
executive  staff;  (2) accounting and financial;  (3) legal and regulatory;  (4)
shareholder  account  maintenance;  (5)  monitoring  and  control  of  custodian
relationships;  (6)  shareholder  reporting;  and (7) review and  evaluation  of
advisory and other services provided to the funds by third parties.

     DISTRIBUTION.  Vanguard Marketing Corporation, a wholly-owned subsidiary of
the Vanguard Group, Inc. provides all distribution and marketing  activities for
the funds in the Group. The principal distribution expenses are for advertising,
promotional materials,  and marketing personnel.  Distribution services may also
include  organizing  and offering to the public,  from time to time, one or more
new investment companies which will become members of Vanguard. The Trustees and
officers of Vanguard  determine the amount to be spent annually on  distribution
activities,  the  manner and  amount to be spent on each  fund,  and  whether to
organize new investment companies.

     One half of the distribution expenses of a marketing and promotional nature
is allocated  among the funds based upon relative net assets.  The remaining one
half of those expenses is allocated among the funds based upon each fund's sales
for the preceding 24 months relative to the total sales of the funds as a group.
Provided,  however,  that no fund's aggregate quarterly rate of contribution for
distribution expenses of a marketing and promotional nature shall exceed 125% of
average distribution expense rate for the Vanguard, and that no fund shall incur
annual distribution  expenses in excess of 20/100 of 1% of its average month-end
net assets.

     During the fiscal years ended  December 31, 1997,  1998, and 1999, the Fund
incurred the following  approximate  amounts of The Vanguard Group's  management
(including transfer agency), distribution, and marketing expenses:  $16,762,000,
$19,534,000, and $19,749,000, respectively.

INVESTMENT ADVISORY SERVICES

     Vanguard also provides  investment  advisory  services to several  Vanguard
funds.  These services are provided on an at-cost basis from a money  management
staff employed directly by Vanguard. The compensation and other expenses of this
staff are paid by the funds utilizing these services.

TRUSTEE COMPENSATION

     The same  individuals  serve as  Trustees of all  Vanguard  funds (with two
exceptions,  which are noted in the table appearing on page B-16), and each fund
pays a proportionate share of the Trustees' compensation. The funds employ their
officers on a shared  basis,  as well.  However,  officers  are  compensated  by
Vanguard, not the funds.

     INDEPENDENT TRUSTEES. The funds compensate their independent Trustees--that
is, the ones who are not also officers of the funds--in three ways:

 .    The  independent  Trustees  receive an annual fee for their  service to the
     funds, which is subject to reduction based on absences from scheduled Board
     meetings.

 .    The  independent  Trustees are reimbursed for the travel and other expenses
     that they incur in attending Board meetings.

                                      B-15

<PAGE>

 .    Upon retirement,  the independent  Trustees receive an aggregate annual fee
     of  $1,000  for each year  served  on the  Board,  up to  fifteen  years of
     service.  This annual fee is paid for ten years  following  retirement,  or
     until each Trustee's death.

     "INTERESTED"  TRUSTEE.  Mr. Brennan serves as a Trustee, but is not paid in
this  capacity.  He is,  however,  paid in his role as officer  of The  Vanguard
Group, Inc.


     COMPENSATION TABLE. The following table provides  compensation  details for
each of the Trustees.  We list the amounts paid as  compensation  and accrued as
retirement benefits by the Fund for each Trustee.  In addition,  the table shows
the total  amount of benefits  that we expect each  Trustee to receive  from all
Vanguard funds upon  retirement,  and the total amount of  compensation  paid to
each Trustee by all Vanguard funds.

                         VANGUARD WELLESLEY INCOME FUND
                          TRUSTEES' COMPENSATION TABLE

<TABLE>
<CAPTION>
<S>                     <C>            <C>                   <C>                <C>

                                           PENSION OR                                 TOTAL
                         AGGREGATE         RETIREMENT                             COMPENSATION
                        COMPENSATION    BENEFITS ACCRUED     ESTIMATED ANNUAL   FROM ALL VANGUARD
                         FROM THIS       AS PART OF THIS       BENEFITS UPON      FUNDS PAID TO
NAMES OF TRUSTEES         FUND(1)      FUND'S EXPENSES(1)        RETIREMENT        TRUSTEES(2)
--------------------------------------------------------------------------------------------------
John C. Bogle(3)            None              None                  None               None
John J. Brennan             None              None                  None               None
JoAnn Heffernan Heisen    $1,555               $86               $15,000            $80,000
Bruce K. MacLaury         $1,609              $144               $12,000            $75,000
Burton G. Malkiel         $1,566              $142               $15,000            $80,000
Alfred M. Rankin, Jr.     $1,555              $104               $15,000            $80,000
John C. Sawhill           $1,555              $131               $15,000            $80,000
James O. Welch, Jr.       $1,555              $152               $15,000            $80,000
J. Lawrence Wilson        $1,555              $110               $15,000            $80,000
</TABLE>
---------
(1)  The amounts  shown in this column are based on the Fund's fiscal year ended
     December 31, 1999.

(2)  The amounts reported in this column reflect the total  compensation paid to
     each Trustee for his or her service as Trustee of 103  Vanguard  funds (102
     in the case of Mr.  Malkiel;  93 in the case of Mr.  MacLaury) for the 1999
     calendar year.

(3)  Mr. Bogle retired from the Fund's Board on December 31, 1999.



                          INVESTMENT ADVISORY SERVICES

The Fund employs  Wellington  Management  Company,  LLP (Wellington  Management)
under an investment advisory agreement to manage the investment and reinvestment
of  Vanguard  Wellesley  Income  Fund's  assets  and  to  continuously   review,
supervise,  and administer the Fund's investment program.  Wellington Management
is a professional  investment counseling firm which provides investment services
to investment companies,  other institutions and individuals.  Among the clients
of Wellington Management are more than 15 Vanguard funds.  Wellington Management
and its predecessor  organizations have provided investment advisory services to
investment companies since 1928 and to investment counseling clients since 1960.
Wellington Management discharges its responsibilities  subject to the control of
the officers and Trustees of the Fund.  Wellington Management is a Massachusetts
limited  liability  partnership  whose managing  partners are Laurie A. Gabriel,
Duncan M. McFarland, and John R. Ryan.

                                      B-16

<PAGE>

     The Fund pays  Wellington  Management  an  advisory  fee at the end of each
fiscal quarter,  calculated by applying a quarterly rate, based on the following
annual  percentage  rates,  to the Fund's  average  month-end net assets for the
quarter:


               NET ASSETS                      ANNUAL RATE
               ----------                      ----------
               First $1 billion........           .100%
               Next $2 billion.........           .050%
               Next $7 billion.........           .040%
               Over $10 billion........           .030%


  The quarterly  payment to Wellington  Management may be increased or decreased
by applying an adjustment  reflecting  the  investment  performance  of the Fund
relative to the investment performance of a "Composite Index," 65% of which will
comprise the Lehman Brothers Corporate A or Better Bond Index (the "Bond Index")
and 35% of which will  comprise a "Blended  Equity  Composite,"  (75% Standard &
Poor's/BARRA  Value Index,  12.5% Standard & Poor's  Utilities  Index, and 12.5%
Standard & Poor's Telephone Index).

     The following table sets forth the adjustment:

               CUMULATIVE 36-MONTH PERFORMANCE        PERFORMANCE FEE
               VERSUS THE COMPOSITE INDEX             ADJUSTMENT*
               --------------------------             -----------------
               Less than -3%.................         -0.20 x Basic Fee
               Between -1.5% and -3%.........         -0.10 x Basic Fee
               Between -1.5% and 1.5%........          0.00 x Basic Fee
               Between +1.5% and +3%.........         +0.10 x Basic Fee
               More than +3%.................         +0.20 x Basic Fee


*For purposes of this  calculation,  the Basic Fee is calculated by applying the
quarterly  rate  against  average  assets  over the same time  period  which the
performance is measured.

     The Composite Index will not become fully operable as the sole  performance
index for purposes of calculating the adjustment  until the quarter ending March
31, 2003.  Until that date,  the  adjustment  will be  determined by linking the
investment performance of the Composite Index and that of the "Prior Benchmark,"
35% of which will  comprise the Blended  Equity  Composite and 65% of which will
comprise the Lehman  Brothers  Long-Term  Corporate AA or Better Bond Index (the
"Prior Bond Index") as follows:

     1. QUARTER  ENDING JUNE 30, 2000.  The  adjustment  will be  determined  by
linking  the  investment  performance  of the  Prior  Benchmark  for the  eleven
quarters ended March 31, 2000,  with that of the Composite Index for the quarter
ending June 30, 2000.

     2. QUARTER ENDING  SEPTEMBER 30, 2000. The adjustment will be determined by
linking the investment  performance of the Prior  Benchmark for the ten quarters
ended March 31, 2000, with that of the Composite Index for the two quarters
ending September 30, 2000.

     3. QUARTER ENDING  DECEMBER 31, 2000. The adjustment  will be determined by
linking the investment  performance of the Prior Benchmark for the nine quarters
ended March 31, 2000,  with that of the Composite  Index for the three  quarters
ending December 31, 2000.

     4. QUARTER  ENDING MARCH 31, 2001.  The  adjustment  will be  determined by
linking the investment performance of the Prior Benchmark for the eight quarters
ended March 31, 2000,  with that of the  Composite  Index for the four  quarters
ending March 31, 2001.

     5. QUARTER  ENDING JUNE 30, 2001.  The  adjustment  will be  determined  by
linking the investment performance of the Prior Benchmark for the seven quarters
ended March 31, 2000,  with that of the  Composite  Index for the five  quarters
ending June 30, 2001.

                                      B-17

<PAGE>

     6. QUARTER ENDING  SEPTEMBER 30, 2001. The adjustment will be determined by
linking the investment  performance of the Prior  Benchmark for the six quarters
ended March 31,  2000,  with that of the  Composite  Index for the six  quarters
ending September 30, 2001.

     7. QUARTER ENDING  DECEMBER 31, 2001. The adjustment  will be determined by
linking the investment  performance of the Prior Benchmark for the five quarters
ended March 31, 2000,  with that of the Composite  Index for the seven  quarters
ending December 31, 2001.

     8. QUARTER  ENDING MARCH 31, 2002.  The  adjustment  will be  determined by
linking the investment  performance of the Prior Benchmark for the four quarters
ended March 31, 2000,  with that of the Composite  Index for the eight  quarters
ending March 31, 2002.

     9. QUARTER  ENDING JUNE 30, 2002.  The  adjustment  will be  determined  by
linking the investment performance of the Prior Benchmark for the three quarters
ended March 31, 2000,  with that of the  Composite  Index for the nine  quarters
ending June 30, 2002.

     10. QUARTER ENDING SEPTEMBER 30, 2002. The adjustment will be determined by
linking the investment  performance of the Prior  Benchmark for the two quarters
ended March 31,  2000,  with that of the  Composite  Index for the ten  quarters
ending September 30, 2002.

     11. QUARTER ENDING  DECEMBER 31, 2002. The adjustment will be determined by
linking the investment  performance  of the Prior  Benchmark for the one quarter
ended March 31, 2000,  with that of the Composite  Index for the eleven quarters
ending December 31, 2002.

     12. QUARTER ENDING MARCH 31, 2003. The Composite Index is fully operable.

     The  investment  performance  of the Fund for any  period,  expressed  as a
percentage  of the  Fund's  net asset  value per share at the  beginning  of the
period,  shall be the sum of (i) the change in the  Fund's  net asset  value per
share  during the period;  (ii) the value of the Fund's cash  distributions  per
share having an ex-dividend date occurring within the period,  and (iii) the per
share  amount of capital  gains taxes paid or accrued  during such period by the
Fund for undistributed realized long-term capital gains.

     COMPOSITE  INDEX.  The  investment  record of the  Composite  Index for any
period,  expressed as a percentage  of the  Composite  Index at the beginning of
such  period,  will be the sum of: (i) the change in the level of the  Composite
Index during the period;  (ii) the value of the interest  accrued or paid on the
bonds  included  in the  Composite  Index,  assuming  the  reinvestment  of such
interest on a monthly basis. Computations of the two components of the Composite
Index will be made at the beginning of each quarter, based on the allocation set
forth in this Agreement.

     BOND  INDEX.  The  investment  record  of the Bond  Index  for the  period,
expressed  as a  percentage  of the Bond Index at the  beginning of such period,
will be the sum of: (i) the change in the level of the  Composite  Index  during
the period; (ii) the value of the interest accrued or paid on the bonds included
in the Composite Index,  assuming the reinvestment of such interest on a monthly
basis.

     BLENDED  EQUITY  COMPOSITE.  The  investment  record of the Blended  Equity
Composite for any period,  expressed as a weighted  percentage of the respective
indexes at the  beginning of such period,  will be the sum of: (i) the change in
the  level  of  the  indexes  during  the  period;  (ii)  the  value,   computed
consistently  with the  applicable  indexes,  of cash  distributions  having  an
ex-dividend  date occurring within the period made by companies whose securities
comprise the applicable indexes.

     PRIOR  BENCHMARK.  The  investment  record of the Prior  Benchmark  for any
period  will be  computed  in the same  manner as that of the  Composite  Index;
provided,  however,  that the Prior Bond Index will be substituted  for the Bond
Index.

     During the fiscal years ended  December 31, 1997,  1998, and 1999, the Fund
incurred investment advisory fees of approximately $3,646,000 before an increase
of  $718,000  based on  performance,  $4,026,000  before an increase of $648,000
based on  performance,  and  $3,763,000  before a decrease of $196,000  based on
performance, respectively.

                                      B-18

<PAGE>

     The present agreement is renewable for successive one-year periods, only if
such renewal is specifically  approved at least annually by a vote of the Fund's
Board of Trustees, including the affirmative votes of a majority of the Trustees
who are not parties to the contract or  "interested  persons" (as defined in the
1940 Act) of any such party,  cast in person at a meeting called for the purpose
of  considering  such  approval.  The agreement is  automatically  terminated if
assigned,  and may be terminated  without penalty at any time (1) either by vote
of the  Board  of  Trustees  of the  Fund or by vote of its  outstanding  voting
securities on 60 days' written notice to the adviser, or (2) by the adviser upon
90 days' written notice to the Fund.

                             PORTFOLIO TRANSACTIONS

The investment  advisory agreement  authorizes  Wellington  Management (with the
approval of the Fund's  Board of Trustees) to select the brokers or dealers that
will execute the  purchases and sales of portfolio  securities  for the Fund and
directs  Wellington  Management  to use its  best  efforts  to  obtain  the best
available  price and most  favorable  execution as to all  transactions  for the
Fund.   Wellington   Management  has  undertaken  to  execute  each   investment
transaction  at a price and commission  which provides the most favorable  total
cost or proceeds reasonably obtainable under the circumstances.

     In placing portfolio transactions,  Wellington Management will use its best
judgment to choose the broker most capable of providing the  brokerage  services
necessary to obtain the best available  price and the most favorable  execution.
The full range and quality of brokerage services available will be considered in
making  these  determinations.   In  those  instances  where  it  is  reasonably
determined that more than one broker can offer the brokerage  services needed to
obtain the best available price and the most favorable execution,  consideration
may be given to those brokers which supply  investment  research and statistical
information and provide other services in addition to execution  services to the
Fund  and/or  Wellington   Management.   Wellington  Management  considers  such
information useful in the performance of its obligations under the agreement but
is unable to  determine  the  amount  by which  such  services  may  reduce  its
expenses.

     The investment advisory agreement also incorporates the concepts of Section
28(e) of the Securities  Exchange Act of 1934 by providing that,  subject to the
approval of the Fund's Board of Trustees,  Wellington  Management  may cause the
Fund to pay a broker-dealer  which furnishes  brokerage and research  services a
higher commission than that which might be charged by another  broker-dealer for
effecting  the  same  transaction;  provided  that  such  commission  is  deemed
reasonable  in  terms of  either  that  particular  transaction  or the  overall
responsibilities of Wellington Management to the Fund.

     Currently,  it is the Fund's policy that Wellington Management may at times
pay higher  commissions in recognition of brokerage  services felt necessary for
the  achievement of better  execution of certain  securities  transactions  that
otherwise  might  not be  available.  Wellington  Management  will only pay such
higher  commissions  if it believes this to be in the best interest of the Fund.
Some brokers or dealers who may receive such higher  commissions  in recognition
of brokerage  services related to execution of securities  transactions are also
providers of research  information  to  Wellington  Management  and/or the Fund.
However,  Wellington Management has informed the Fund that it generally will not
pay higher commission rates  specifically for the purpose of obtaining  research
services.

     Since the Fund does not market its shares through  intermediary  brokers or
dealers,  it is not the Fund's  practice  to  allocate  brokerage  or  principal
business on the basis of sales of its shares which may be executed  through such
firms.   However,   the  Fund  may  place   portfolio   orders  with   qualified
broker-dealers  who recommend the Fund to other clients,  or who act as agent in
the purchase of the Fund's shares for their  clients,  and may, when a number of
brokers  and  dealers  can  provide  comparable  best price and  execution  on a
particular  transaction,  consider the sale of Fund shares by a broker or dealer
in selecting among qualified broker-dealers.

                                      B-19

<PAGE>

     During the fiscal years ended  December 31, 1997,  1998, and 1999, the Fund
paid  approximately   $2,672,000,   $1,984,000,   and  $2,600,848  in  brokerage
commissions, respectively.

     Some  securities  considered  for  investment  by  the  Fund  may  also  be
appropriate  for other  Vanguard Funds and/or other clients served by Wellington
Management.  If purchases or sales of securities  consistent with the investment
policies  of the Fund,  the other  Vanguard  funds,  and/or one or more of these
other clients  serviced by Wellington  Management are considered at or about the
same time,  transactions  in such securities will be allocated among the several
Funds  and  clients  in a manner  deemed  equitable  by  Wellington  Management.
Although there will be no specified  formula for allocating  such  transactions,
the  allocation  methods  used,  and the  results of such  allocations,  will be
subject to periodic review by the Fund's Board of Trustees.

                               COMPARATIVE INDEXES

Each of the investment company members of The Vanguard Group, including Vanguard
Wellesley  Income Fund, may, from time to time, use one or more of the following
unmanaged indexes for comparative performance purposes.

STANDARD & POOR'S 500 COMPOSITE STOCK PRICE  INDEX--includes  stocks selected by
Standard & Poor's  Index  Committee  to  include  leading  companies  in leading
industries and to reflect the U.S. stock market.

STANDARD & POOR'S  MIDCAP 400  INDEX--is  composed of 400 medium sized  domestic
stocks.

STANDARD & POOR'S  SMALLCAP  600/BARRA VALUE  INDEX--contains  stocks of the S&P
SmallCap 600 Index which have a lower than average price-to-book ratio.

STANDARD & POOR'S SMALLCAP  600/BARRA GROWTH  INDEX--contains  stocks of the S&P
SmallCap 600 Index which have a higher than average price-to-book ratio.

RUSSELL  1000  VALUE  INDEX--consists  of the stocks in the  Russell  1000 Index
(comprising  the 1,000  largest  U.S.-based  companies  measured by total market
capitalization)  with the lowest  price-to-book  ratios,  comprising  50% of the
market capitalization of the Russell 1000.

WILSHIRE  5000 TOTAL MARKET  INDEX--consists  of more than 7,000  common  equity
securities,  covering  all  stocks  in the  U.S.  for  which  daily  pricing  is
available.

WILSHIRE  4500  COMPLETION  INDEX--consists  of all stocks in the Wilshire  5000
except for the 500 stocks in the Standard and Poor's 500 Index.

MORGAN  STANLEY  CAPITAL  INTERNATIONAL  EAFE  INDEX--is an  arithmetic,  market
value-weighted  average of the performance of over 900 securities  listed on the
stock exchanges of countries in Europe, Australia, Asia and the Far East.

GOLDMAN SACHS 100  CONVERTIBLE  BOND  INDEX--currently  includes 71 bonds and 29
preferreds.   The  original  list  of  names  was  generated  by  screening  for
convertible  issues of $100  million or greater  in market  capitalization.  The
index is priced monthly.

SALOMON BROTHERS GNMA  INDEX--includes  pools of mortgages originated by private
lenders and guaranteed by the mortgage pools of the Government National Mortgage
Association.

SALOMON BROTHERS HIGH-GRADE  CORPORATE BOND  INDEX--consists of publicly issued,
non-convertible  corporate bonds rated Aa or Aaa. It is a value-weighted,  total
return index, including  approximately 800 issues with maturities of 12 years or
greater.

LEHMAN BROTHERS  LONG-TERM  TREASURY BOND INDEX--is a market weighted index that
contains  individually  priced U.S.  Treasury  securities  with maturities of 10
years or greater.

MERRILL LYNCH  CORPORATE & GOVERNMENT  BOND  INDEX--consists  of over 4,500 U.S.
Treasury, agency and investment grade corporate bonds.

                                      B-20

<PAGE>

LEHMAN BROTHERS  CORPORATE (BAA) BOND  INDEX--consists  of all publicly  offered
fixed-rate, nonconvertible domestic corporate bonds rated Baa by Moody's, with a
maturity longer than one year and with more than $100 million outstanding.  This
index includes over 1,500 issues.

LEHMAN  BROTHERS  LONG-TERM  CORPORATE  BOND  INDEX--is  a subset of the  Lehman
Brothers   Corporate  Bond  Index  covering  all  corporate,   publicly   issued
fixed-rate, nonconvertible US debt issues rated at least Baa, with at least $100
million principal outstanding and maturity greater than 10 years.

BOND BUYER  MUNICIPAL BOND INDEX--is a yield index on current coupon  high-grade
general obligation municipal bonds.

MERRILL  LYNCH  DRD-ELIGIBLE  INDEX--includes  preferred  stock issues which are
eligible for the corporate dividends-received-deduction.

NASDAQ INDUSTRIAL INDEX--is composed of more than 3,000 industrial issues. It is
a  value-weighted  index  calculated  on price  change only and does not include
income.

COMPOSITE  INDEX--70%  Standard  & Poor's  500 Index and 30%  NASDAQ  Industrial
Index.

COMPOSITE  INDEX--65%  Standard  & Poor's  500  Index  and 35%  Lehman  Brothers
Corporate A or Better Bond Index.

COMPOSITE  INDEX--65% Lehman Brothers Corporate A or Better Bond Index and a 35%
weighting in a blended  equity  composite  (75%  Standard &  Poor's/BARRA  Value
Index,  12.5%  Standard  & Poor's  Utilities  Index and 12.5%  Standard & Poor's
Telephone Index).

LEHMAN BROTHERS  LONG-TERM  CORPORATE AA OR BETTER BOND  INDEX--consists  of all
publicly    issued,    fixed    rate,     nonconvertible    investment    grade,
dollar-denominated, SEC-registered corporate debt rated AA or AAA.

LEHMAN  BROTHERS  CORPORATE A OR BETTER  BOND  INDEX--consists  of all  publicly
issued,  investment  grade  corporate  bonds rated A or better,  of all maturity
levels.

RUSSELL  2000 STOCK  INDEX--consists  of the smallest  2,000  stocks  within the
Russell 3000; a widely-used benchmark for small capitalization common stocks.

LEHMAN BROTHERS  AGGREGATE BOND INDEX--is a market-weighted  index that contains
individually priced U.S.Treasury,  agency,  corporate, and mortgage pass-through
securities  corporate rated BBB- or better. The Index has a market value of over
$5 trillion.

LEHMAN  BROTHERS  MUTUAL  FUND  SHORT  (1-5)  GOVERNMENT/CORPORATE  INDEX--is  a
market-weighted index that contains  individually priced U.S. Treasury,  agency,
and  corporate  investment  grade  bonds  rated BBB- or better  with  maturities
between 1 and 5 years. The index has a market value of over $1.6 trillion.

LEHMAN BROTHERS MUTUAL FUND INTERMEDIATE (5-10) GOVERNMENT/CORPORATE INDEX--is a
market-weighted index that contains  individually priced U.S. Treasury,  agency,
and corporate  securities rated BBB- or better with maturities  between 5 and 10
years. The index has a market value of over $800 billion.

LEHMAN  BROTHERS  LONG (10+)  GOVERNMENT/CORPORATE  INDEX--is a  market-weighted
index that contains  individually  priced U.S.  Treasury,  agency, and corporate
securities rated BBB- or better with maturities greater than 10 years. The index
has a market value of over $1.1 trillion.

LIPPER BALANCED FUND  AVERAGE--an  industry  benchmark of average balanced funds
with similar investment objectives and policies, as measured by Lipper Inc.

LIPPER  NON-GOVERNMENT  MONEY  MARKET FUND  AVERAGE--an  industry  benchmark  of
average non-government money market funds with similar investment objectives and
policies, as measured by Lipper Inc.

                                      B-21

<PAGE>

LIPPER  GOVERNMENT MONEY MARKET FUND AVERAGE--an  industry  benchmark of average
government money market funds with similar  investment  objectives and policies,
as measured by Lipper Inc.

LIPPER SMALL  COMPANY  GROWTH FUND  AVERAGE--the  average  performance  of small
company  growth funds as defined by Lipper Inc.  Lipper  defines a small company
growth  fund as a fund that by  prospectus  or  portfolio  practice,  limits its
investments  to companies on the basis of the size of the company.  From time to
time,  Vanguard may advertise using the average  performance  and/or the average
expense ratio of the small company  growth funds.  (This fund category was first
established  in 1982.  For years prior to 1982,  the results of the Lipper Small
Company  Growth  category  were  estimated  using the  returns of the Funds that
constituted the Group at its inception.)

LIPPER GENERAL EQUITY FUND  AVERAGE--an  industry  benchmark of average  general
equity funds with similar  investment  objectives  and policies,  as measured by
Lipper Inc.

LIPPER FIXED-INCOME FUND AVERAGE--an  industry benchmark of average fixed-income
funds with similar  investment  objectives  and policies,  as measured by Lipper
Inc.

RUSSELL  3000  INDEX--consists  of  approximately  the 3,000  largest  stocks of
U.S.-domiciled  companies  commonly  traded on the New York and  American  Stock
Exchanges or the NASDAQ over-the-counter market,  accounting for over 90% of the
market value of publicly traded Stocks in the U.S.

                              FINANCIAL STATEMENTS

The Fund's Financial  Statements for the year ended December 31, 1999, including
the financial highlights for each of the five years in the period ended December
31, 1999,  appearing in the Vanguard  Wellesley Income Fund's 1999 Annual Report
to  Shareholders,   and  the  report  thereon  of  PricewaterhouseCoopers   LLP,
independent  accountants,  also appearing therein, are incorporated by reference
in this Statement of Additional  Information.  For a more complete discussion of
the performance, please see the Fund's Annual Report to Shareholders,  which may
be obtained without charge.

                APPENDIX--DESCRIPTION OF SECURITIES AND RATINGS

The Fund will invest in investment grade bonds (i.e. those rated at least Baa by
Moody's  Investors  Service,  Inc.  or  those  rated  BBB by  Standard  & Poor's
Corporation).  In the  event  that a bond  held by the Fund is  downgraded,  the
adviser may continue to hold such bond.

     The following are excerpts from Moody's Investors Service, Inc. description
of its four highest preferred bond ratings:

AAA--judged to be the best quality by all standards;  AA--together  with the Aaa
group,  comprise what are generally  known as high grade bonds;  A--possess many
favorable investment  attributes and are to be considered as "upper medium grade
obligations";  BAA--considered  as  medium  grade  obligations;  i.e.,  they are
neither highly  protected nor poorly  secured.  Interest  payments and principal
security appear adequate for the present but certain protective  elements may be
lacking or may be  characteristically  unreliable over any great length of time.
Such  bonds lack  outstanding  investment  characteristics  and,  in fact,  have
speculative characteristics as well.

     Moody's  also  supplies  numerical   indicators  1,  2,  and  3  to  rating
categories.  The modifier 1 indicates  that the security is in the higher end of
its rating  category;  the  modifier 2  indicates  a  mid-range  ranking;  and 3
indicates a ranking toward the lower end of the category.

     The following are excerpts from Standard & Poor's  Corporation  description
of its four highest stock ratings:

AAA--highest grade obligations.  Capacity to pay interest and repay principal is
extremely  strong;  AA--also  qualify as high grade  obligations,  a very strong
capacity to pay interest and repay

                                      B-22

<PAGE>

principal and differs from AAA issues only in small degree; A--regarded as upper
medium grade.  They have a strong  capacity to pay interest and repay  principal
although somewhat susceptible to the adverse effects of changes in circumstances
and economic  conditions than debt in higher rated categories;  BBB--regarded as
having an adequate  capacity to pay interest and repay  principal.  Whereas they
normally exhibit adequate protection parameters,  adverse economic conditions or
changing  circumstances  are more  likely to lead to a weakened  capacity to pay
interest  and repay  principal  for debt in this  category  than in higher rated
categories.  This  group is the  lowest  which  qualifies  for  commercial  bank
investment.

     Standard & Poor's  applies  indicators  "+",  no  character  and "-" to its
rating categories. The indicators show relative standing within the major rating
categories.

                                                         SAI027-WELLESLEY INCOME

                                      B-23



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