MFS SERIES TRUST IV
497, 1997-09-04
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<PAGE>
                         Massachusetts Investors Trust
                   Massachusetts Investors Growth Stock Fund
                            MFS(R) Capital Growth Fund
                           MFS(R) Emerging Growth Fund
                       MFS(R) Gold & Natural Resources Fund
                         MFS(R) Growth Opportunities Fund
                           MFS(R) Managed Sectors Fund
                                 MFS(R) OTC Fund
                               MFS(R) Research Fund
                                MFS(R) Value Fund
                             MFS(R) Total Return Fund
                              MFS(R) Utilities Fund
                                 MFS(R) Bond Fund
                         MFS(R) Government Mortgage Fund
                        MFS(R) Government Securities Fund
                             MFS(R) High Income Fund
                         MFS(R) Intermediate Income Fund
                           MFS(R) Strategic Income Fund
                     MFS(R) Government Limited Maturity Fund
                           MFS(R) Limited Maturity Fund
                             MFS(R) World Equity Fund
                          MFS(R) World Governments Fund
                             MFS(R) World Growth Fund
                          MFS(R) World Total Return Fund
                        MFS(R) World Asset Allocation Fund
                             MFS(R) Cash Reserve Fund
                       MFS(R) Government Money Market Fund
                             MFS(R) Money Market Fund

                      Supplement to the Current Prospectus


Class A shares of the Fund may be  purchased  at net asset  value by  retirement
plans whose third party  administrators  have entered into an agreement with MFS
Fund  Distributors,  Inc.  ("MFD") or one or more of its  affiliates  to perform
certain  administrative  services,  subject to certain operational  requirements
specified from time to time by MFD or its affiliates.

In lieu  of the  sales  commission  and  service  fees  normally  paid by MFD to
broker-dealers  of record as described in the Prospectus,  MFD has agreed to pay
Bear, Stearns & Co. Inc. the following amounts with respect to Class A shares of
the Fund purchased through a special  retirement plan program offered by a third
party administrator: (i) an amount equal to 0.05% per annum of the average daily
net assets invested in shares of the Fund pursuant to such program,  and (ii) an
amount  equal to 0.20% of the net asset value of all net  purchases of shares of
the Fund made through such  program,  subject to a refund in the event that such
shares are redeemed within 36 months.

                The date of this Supplement is February 1, 1995.
<PAGE>




                             MFS(R) CASH RESERVE FUND
                   MASSACHUSETTS INVESTORS GROWTH STOCK FUND
                             MFS(R) TOTAL RETURN FUND
                MFS/FOREIGN & COLONIAL INTERNATIONAL GROWTH FUND
                         MFS(R) GROWTH OPPORTUNITIES FUND
          MFS/FOREIGN & COLONIAL INTERNATIONAL GROWTH AND INCOME FUND
                           MFS(R) EMERGING GROWTH FUND
              MFS/FOREIGN & COLONIAL EMERGING MARKETS EQUITY FUND
                            MFS(R) CAPITAL GROWTH FUND
                        MFS(R) ALABAMA MUNICIPAL BOND FUND
                         MFS(R) INTERMEDIATE INCOME FUND
                       MFS(R) ARKANSAS MUNICIPAL BOND FUND
                       MFS(R) GOLD & NATURAL RESOURCES FUND
                      MFS(R) CALIFORNIA MUNICIPAL BOND FUND
                           MFS(R) MANAGED SECTORS FUND
                        MFS(R) FLORIDA MUNICIPAL BOND FUND
                                MFS(R) VALUE FUND
                        MFS(R) GEORGIA MUNICIPAL BOND FUND
                              MFS(R) UTILITIES FUND
                       MFS(R) MARYLAND MUNICIPAL BOND FUND
                             MFS(R) WORLD EQUITY FUND
                     MFS(R) MASSACHUSETTS MUNICIPAL BOND FUND
                          MFS(R) WORLD TOTAL RETURN FUND
                      MFS(R) MISSISSIPPI MUNICIPAL BOND FUND
                                 MFS(R) BOND FUND
                       MFS(R) NEW YORK MUNICIPAL BOND FUND
                           MFS(R) LIMITED MATURITY FUND
                    MFS(R) NORTH CAROLINA MUNICIPAL BOND FUND
                         MFS(R) GOVERNMENT MORTGAGE FUND
                     MFS(R) PENNSYLVANIA MUNICIPAL BOND FUND
                     MFS(R) GOVERNMENT LIMITED MATURITY FUND
                    MFS(R) SOUTH CAROLINA MUNICIPAL BOND FUND
                        MFS(R) GOVERNMENT SECURITIES FUND
                       MFS(R) TENNESSEE MUNICIPAL BOND FUND
                             MFS(R) HIGH INCOME FUND
                       MFS(R) VIRGINIA MUNICIPAL BOND FUND
                           MFS(R) STRATEGIC INCOME FUND
                     MFS(R) WEST VIRGINIA MUNICIPAL BOND FUND
                          MFS(R) WORLD GOVERNMENTS FUND
                      MFS(R) MUNICIPAL LIMITED MATURITY FUND
                             MFS(R) WORLD GROWTH FUND
                            MFS(R) MUNICIPAL BOND FUND
                                 MFS(R) OTC FUND
                           MFS(R) MUNICIPAL INCOME FUND
                        MFS(R) MUNICIPAL HIGH INCOME FUND
                               MFS(R) RESEARCH FUND
                       MFS(R) GOVERNMENT MONEY MARKET FUND
                        MFS(R) WORLD ASSET ALLOCATION FUND
                         MASSACHUSETTS INVESTORS TRUST
                             MFS(R) MONEY MARKET FUND
                      MFS(R) RESEARCH GROWTH AND INCOME FUND

                      Supplement to the Current Prospectus

         The following  information  supplements the disclosure  found under the
caption  "Information  Concerning  Shares  of  the  Fund  -  Purchases"  in  the
Prospectus:


         MFS Fund  Distributors,  Inc.  ("MFD"),  the distributor of each of the
         above-named funds (the "Funds"), has entered into a long-term exclusive
         marketing agreement with IBAA Financial Services Corporation  ("IBFS"),
         pursuant  to  which  MFD  has  agreed  to  pay  IBFS,   as   additional
         compensation  for IBFS'  marketing and  distribution  of the Funds,  an
         annual amount  (subject to a minimum) based upon the value of shares of
         the Funds for which IBFS acts as broker-dealer of record plus the value
         of shares of the Funds sold by IBFS during such year.

                The date of this Supplement is February 1, 1997.

<PAGE>




                             MFS(R) CASH RESERVE FUND
          MFS/FOREIGN & COLONIAL INTERNATIONAL GROWTH AND INCOME FUND
                             MFS(R) TOTAL RETURN FUND
                   MASSACHUSETTS INVESTORS GROWTH STOCK FUND
                MFS/FOREIGN & COLONIAL INTERNATIONAL GROWTH FUND
                         MFS(R) GROWTH OPPORTUNITIES FUND
                           MFS(R) EMERGING GROWTH FUND
                        MFS(R) ALABAMA MUNICIPAL BOND FUND
                            MFS(R) CAPITAL GROWTH FUND
                       MFS(R) ARKANSAS MUNICIPAL BOND FUND
                         MFS(R) INTERMEDIATE INCOME FUND
                      MFS(R) CALIFORNIA MUNICIPAL BOND FUND
                         MASSACHUSETTS INVESTORS TRUST
                        MFS(R) FLORIDA MUNICIPAL BOND FUND
                           MFS(R) MANAGED SECTORS FUND
                        MFS(R) GEORGIA MUNICIPAL BOND FUND
                                MFS(R) VALUE FUND
                       MFS(R) MARYLAND MUNICIPAL BOND FUND
                              MFS(R) UTILITIES FUND
                     MFS(R) MASSACHUSETTS MUNICIPAL BOND FUND
                             MFS(R) WORLD EQUITY FUND
                      MFS(R) MISSISSIPPI MUNICIPAL BOND FUND
                          MFS(R) WORLD TOTAL RETURN FUND
                       MFS(R) NEW YORK MUNICIPAL BOND FUND
                                 MFS(R) BOND FUND
                    MFS(R) NORTH CAROLINA MUNICIPAL BOND FUND
                           MFS(R) LIMITED MATURITY FUND
                     MFS(R) PENNSYLVANIA MUNICIPAL BOND FUND
                         MFS(R) GOVERNMENT MORTGAGE FUND
                    MFS(R) SOUTH CAROLINA MUNICIPAL BOND FUND
                     MFS(R) GOVERNMENT LIMITED MATURITY FUND
                       MFS(R) TENNESSEE MUNICIPAL BOND FUND
                        MFS(R) GOVERNMENT SECURITIES FUND
                       MFS(R) VIRGINIA MUNICIPAL BOND FUND
                             MFS(R) HIGH INCOME FUND
                     MFS(R) WEST VIRGINIA MUNICIPAL BOND FUND
                           MFS(R) STRATEGIC INCOME FUND
                      MFS(R) MUNICIPAL LIMITED MATURITY FUND
                          MFS(R) WORLD GOVERNMENTS FUND
                            MFS(R) MUNICIPAL BOND FUND
                             MFS(R) WORLD GROWTH FUND
                           MFS(R) MUNICIPAL INCOME FUND
                                 MFS(R) OTC FUND
                               MFS(R) RESEARCH FUND
              MFS/FOREIGN & COLONIAL EMERGING MARKETS EQUITY FUND
                        MFS(R) WORLD ASSET ALLOCATION FUND
                             MFS(R) MONEY MARKET FUND
                        MFS(R) MUNICIPAL HIGH INCOME FUND
                       MFS(R) GOVERNMENT MONEY MARKET FUND
                      MFS(R) RESEARCH GROWTH AND INCOME FUND
                           MFS(R) STRATEGIC GROWTH FUND



                      Supplement to the Current Prospectus



The following  provisions  shall apply to any  retirement  plan (each a "Merrill
Lynch Daily K Plan") whose records are maintained on a daily  valuation basis by
either Merrill Lynch, Pierce, Fenner & Smith Incorporated  ("Merrill Lynch"), or
by an independent  recordkeeper (an "Independent  Recordkeeper")  whose services
are provided through a contract or alliance  arrangement with Merrill Lynch, and
with respect to which the sponsor of such plan has entered into a  recordkeeping
service   agreement   with  Merrill  Lynch  (a  "Merrill   Lynch   Recordkeeping
Agreement").

The initial  sales  charge  imposed on purchases of Class A shares of the Funds,
and the contingent deferred sales charge ("CDSC") imposed on certain redemptions
of Class A shares of the Funds,  is waived in the following  circumstances  with
respect to a Merrill Lynch Daily K Plan:

         (i)      if,  on the date the Plan  sponsor  signs  the  Merrill  Lynch
                  Recordkeeping  Agreement,  such Plan has $3 million or more in
                  assets  invested  in  broker-dealer  sold funds not advised or
                  managed by Merrill Lynch Asset  Management L.P.  ("MLAM") that
                  are made  available  pursuant to  agreements  between  Merrill
                  Lynch   and   such   funds'    principal    underwriters    or
                  distributors,   and  in  funds  advised  or  managed  by  MLAM
                  (collectively, the "Applicable Investments"); or

         (ii)     if  such  Plan's  records  are  maintained  by an  Independent
                  Recordkeeper  and,  on the  date the Plan  sponsor  signs  the
                  Merrill  Lynch  Recordkeeping  Agreement,  such  Plan  has  $3
                  million  or more in  assets,  excluding  money  market  funds,
                  invested in Applicable Investments; or

         (iii)    such Plan has 500 or more eligible employees, as determined by
                  the Merrill Lynch plan conversion manager on the date the Plan
                  sponsor signs the Merrill Lynch Recordkeeping Agreement.
<PAGE>

         The CDSC imposed on redemptions of Class B shares of the Fund is waived
         in the following  circumstances with respect to a Merrill Lynch Daily K
         Plan:

         (i)      if,  on the date the Plan  sponsor  signs  the  Merrill  Lynch
                  Recordkeeping Agreement, such Plan has less than $3 million in
                  assets invested in Applicable Investments;

         (ii)     if  such  Plan's  records  are  maintained  by an  independent
                  recordkeeper  and,  on the  date the Plan  sponsor  signs  the
                  Merrill Lynch Recordkeeping Agreement, such Plan has less than
                  $3 million  dollars in assets,  excluding  money market funds,
                  invested in Applicable Investments; or

         (iii)    such Plan has fewer than 500 eligible employees, as determined
                  by the Merrill Lynch plan  conversion  manager on the date the
                  Plan sponsor signs the Merrill Lynch Recordkeeping Agreement.

No front-end  commissions are paid with respect to any Class A or Class B shares
of the Fund purchased by any Merrill Lynch Daily K Plan.

                  The date of this Supplement is June 5, 1997.


<PAGE>



                             MFS CASH RESERVE FUND
          MFS/FOREIGN & COLONIAL INTERNATIONAL GROWTH AND INCOME FUND
                             MFS TOTAL RETURN FUND
                   MASSACHUSETTS INVESTORS GROWTH STOCK FUND
                MFS/FOREIGN & COLONIAL INTERNATIONAL GROWTH FUND
                         MFS GROWTH OPPORTUNITIES FUND
                            MFS EMERGING GROWTH FUND
                        MFS ALABAMA MUNICIPAL BOND FUND
                            MFS CAPITAL GROWTH FUND
                        MFS ARKANSAS MUNICIPAL BOND FUND
                          MFS INTERMEDIATE INCOME FUND
                       MFS CALIFORNIA MUNICIPAL BOND FUND
                         MASSACHUSETTS INVESTORS TRUST
                        MFS FLORIDA MUNICIPAL BOND FUND
                            MFS MANAGED SECTORS FUND
                        MFS GEORGIA MUNICIPAL BOND FUND
                                 MFS VALUE FUND
                        MFS MARYLAND MUNICIPAL BOND FUND
                               MFS UTILITIES FUND
                     MFS MASSACHUSETTS MUNICIPAL BOND FUND
                             MFS WORLD EQUITY FUND
                      MFS MISSISSIPPI MUNICIPAL BOND FUND
                          MFS WORLD TOTAL RETURN FUND
                        MFS NEW YORK MUNICIPAL BOND FUND
                                 MFS BOND FUND
                     MFS NORTH CAROLINA MUNICIPAL BOND FUND
                           MFS LIMITED MATURITY FUND
                      MFS PENNSYLVANIA MUNICIPAL BOND FUND
                          MFS GOVERNMENT MORTGAGE FUND
                     MFS SOUTH CAROLINA MUNICIPAL BOND FUND
                      MFS GOVERNMENT LIMITED MATURITY FUND
                       MFS TENNESSEE MUNICIPAL BOND FUND
                         MFS GOVERNMENT SECURITIES FUND
                        MFS VIRGINIA MUNICIPAL BOND FUND
                              MFS HIGH INCOME FUND
                     MFS WEST VIRGINIA MUNICIPAL BOND FUND
                           MFS STRATEGIC INCOME FUND
                      MFS MUNICIPAL LIMITED MATURITY FUND
                           MFS WORLD GOVERNMENTS FUND
                            MFS MUNICIPAL BOND FUND
                             MFS WORLD GROWTH FUND
                           MFS MUNICIPAL INCOME FUND
                                  MFS OTC FUND
                               MFS RESEARCH FUND
              MFS/FOREIGN & COLONIAL EMERGING MARKETS EQUITY FUND
                        MFS WORLD ASSET ALLOCATION FUND
                             MFS MONEY MARKET FUND
                         MFS MUNICIPAL HIGH INCOME FUND
                        MFS GOVERNMENT MONEY MARKET FUND
                      MFS RESEARCH GROWTH AND INCOME FUND
                           MFS STRATEGIC GROWTH FUND


                      SUPPLEMENT TO THE CURRENT PROSPECTUS


This supplement describes certain changes, effective immediately, to each Fund's
Prospectus.

1. DEFINITION OF "DEALER". As used in the Prospectus and any appendices thereto,
the term  "dealer"  includes  any broker,  dealer,  bank  (including  bank trust
departments),  registered  investment  adviser,  financial planner and any other
financial  institutions  having a selling  agreement or other similar  agreement
with MFS Fund Distributors,  Inc. ("MFD").  The use of the defined term "dealer"
does not mean or imply that any such  financial  intermediary  necessarily  is a
"dealer" for purposes of any federal or state laws,  rules or regulations or any
self-regulatory organization's rules.

2. CHANGES  TO  SALES  CHARGE  WAIVER   CATEGORIES.   Appendix  A  to  the
Prospectus, which describes waivers of sales charges, is amended as follows:

              Wrap  Account  and Fund  "Supermarket"  Investments.  The  waiver
              category entitled "2. Wrap Account Investments" under "II. Waivers
              of Class A Sales  Charges"  is amended to read in its  entirety as
              follows:

                      2. Wrap Account and Fund "Supermarket" Investments Shares
                      acquired by investments through certain dealers (including
                      registered  investment  advisers and  financial  planners)
                      which have established  certain  operational  arrangements
                      with MFD which include a  requirement  that such shares be
                      sold for the sole  benefit of clients  participating  in a
                      "wrap"  account,  mutual fund  "supermarket"  account or a
                      similar program under which such clients pay a fee to such
                      dealer.

                 The date of this Supplement is August 8, 1997.


<PAGE>

                            MFS MID CAP GROWTH FUND
                        (Formerly known as MFS OTC Fund)

   Supplement to the September 1, 1997 Prospectus and Statement of Additional
                                  Information


     The following  information  should be read in  conjunction  with the Fund's
Prospectus and Statement of Additional  Information ("SAI"),  dated September 1,
1997, and contains a description of Class I shares.

     Class I shares are  available  for  purchase  only by certain  investors as
described under the caption "Eligible Purchasers" below.

EXPENSE SUMMARY

Shareholder Transaction Expenses:                                       Class I
   Maximum Initial Sales Charge Imposed on Purchases of Fund
     Shares (as a percentage of offering price)........................  None
   Maximum Contingent Deferred Sales Charge (as a percentage
     of original purchase price or redemption proceeds, as applicable).  None

Annual Operating Expenses of the Fund (as a percentage of average net assets):
   Management Fees.....................................................  0.75%
   Rule 12b-1 Fees.....................................................  None
   Other Expenses(1)(2)................................................  0.485%
   Total Operating Expenses............................................  1.235%
                                                                      .........
(1)  "Other  Expenses" is based on Class A expenses  incurred  during the fiscal
     year ended August 31, 1996.
(2)  The Fund  has an  expense  offset  arrangement  which  reduces  the  Fund's
     custodian fee based upon the amount of cash maintained by the Fund with its
     custodian  and  dividend  disbursing  agent,  and may enter into other such
     arrangements and directed brokerage arrangements (which would also have the
     effect of reducing the Fund's  expenses).  Any such fee  reductions are not
     reflected under "Other Expenses."

                              Example of Expenses

     An investor would pay the following  dollar amounts of expenses on a $1,000
investment  in Class I shares of the Fund,  assuming (a) a 5% annual  return and
(b) redemption at the end of each of the time periods indicated:

                           Period                    Class I

                           1 year................      $13
                           3 years...............       39

     The  purpose  of  the  expense  table  above  is  to  assist  investors  in
understanding the various costs and expenses that a shareholder of the Fund will
bear  directly  or  indirectly.  A  more  complete  description  of  the  Fund's
management  fee is set forth under the caption  "Management  of the Fund" in the
Prospectus.

The "Example" set forth above should not be considered a representation  of past
or future  expenses  of the Fund;  actual  expenses  may be greater or less than
those shown.

CONDENSED FINANCIAL INFORMATION

     The following  information  is unaudited and should be read in  conjunction
with the financial statements included in the Fund's Semiannual Report to 
shareholders which are incorporated by reference into the SAI.
<PAGE>

                              Financial Highlights


                                                                 Period Ended
                                                              February 28, 1997
                                                                 (Unaudited)*

                                                                   Class I
Per share data (for a share outstanding throughout each period):
Net asset value - beginning of period                              $  8.63
                                                                   -------
Income from investment operations# -
     Net investment income (loss)                                  $ (0.01)
     Net realized and unrealized gain (loss) on investments and
       foreign currency transactions                                 (0.47)
                                                                   ---------
         Total from investment operations                          $ (0.48)
                                                                   --------
Less distributions declared to shareholders -
     From net realized gain on investments and
       foreign currency transactions                               $  --
     In excess of net realized gain on investments and
       foreign currency transactions                                  --
                                                                   -------
         Total distributions declared to shareholders              $  --
                                                                   -------
Net asset value - end of period                                    $  8.15
                                                                   =======
Total return                                                        (5.89)%***
Ratios (to average net assets)/Supplemental data:
     Expenses##                                                     1.35%**
     Net investment loss                                           (1.18)%**
Portfolio turnover                                                 101%
Average commission rate###                                         $0.0317
Net assets at end of period (000 omitted)                          $1,494
- --------------------------
*     For the period from the commencement of offering of Class I shares,
      January 2, 1997.
**    Annualized
***   Not Annualized
#     Per share data is based upon average shares outstanding.
##    For fiscal years ending after September 1, 1995, the fund's expenses are
      calculated without reduction for fees paid indirectly.
###   Average commission rate is calculated for funds with fiscal years
      beginning on or after September 1, 1995.

ELIGIBLE PURCHASERS

Class I shares are  available  for  purchase  only by the  following  purchasers
("Eligible Purchasers"):

(i)  certain  retirement  plans  established  for the  benefit of  employees  of
     Massachusetts  Financial  Services Company ("MFS"),  the Fund's  investment
     adviser, and employees of MFS' affiliates;

(ii) any fund distributed by MFS Fund  Distributors,  Inc.  ("MFD"),  the Fund's
     distributor,  if the fund  seeks to achieve  its  investment  objective  by
     investing  primarily in shares of the Fund and other funds  distributed  by
     MFD;

(iii)any retirement  plan,  endowment or foundation  which (a) purchases  shares
     directly through MFD (rather than through a third party broker or dealer or
     other financial intermediary);  (b) has, at the time of purchase of Class I
     shares, aggregate assets of at least $100 million; and (c) invests at least
     $10  million in Class I shares of the Fund either  alone or in  combination
     with  investments  in Class I shares of other MFS funds  distributed by MFD
     (additional  investments may be made in any amount);  provided that MFD may
     accept  purchases  from smaller  plans,  endowments  or  foundations  or in
     smaller amounts if it believes, in its sole discretion,  that such entity's
     aggregate  assets  will equal or exceed $100  million,  or that such entity
     will make additional  investments  which will cause its total investment to
     equal or exceed $10 million, within a reasonable period of time; and

(iv) bank trust  departments  which initially  invest,  on behalf of their trust
     clients,  at  least  $100,000  in Class I  shares  of the Fund  (additional
     investments  may be made  in any  amount);  provided  that  MFD may  accept
     smaller initial purchases if it believes, in its sole discretion,  that the
     bank trust  department will make additional  investments,  on behalf of its
     trust  clients,  which will cause its total  investment  to equal or exceed
     $100,000 within a reasonable period of time.
<PAGE>

In no event will the Fund,  MFS,  MFD or any of their  affiliates  pay any sales
commissions or  compensation  to any third party in connection  with the sale of
Class I shares; the payment of any such sales commission or compensation  would,
under the Fund's policies,  disqualify the purchaser as an eligible  investor of
Class I shares.

SHARE CLASSES OFFERED BY THE FUND

     Four classes of shares of the Fund currently are offered for sale,  Class A
shares,  Class B shares,  Class C shares and Class I shares.  Class I shares are
available for purchase only by Eligible  Purchasers,  as defined above,  and are
described in this Supplement.  Class A shares, Class B shares and Class C shares
are  described in the Fund's  Prospectus  and are  available for purchase by the
general public.

     Class A shares are offered at net asset value plus an initial  sales charge
up to a maximum of 5.75% of the offering  price (or a contingent  deferred sales
charge (a "CDSC") upon  redemption of 1.00% during the first year in the case of
purchases of $1 million or more and certain purchases by retirement  plans), and
are  subject to an annual  distribution  fee and  service fee up to a maximum of
0.35% per  annum.  Class B shares  are  offered  at net asset  value  without an
initial sales charge but are subject to a CDSC upon  redemption  (declining from
4.00%  during the first  year to 0% after six years) and an annual  distribution
fee and service fee up to a maximum of 1.00% per annum;  Class B shares  convert
to Class A shares  approximately eight years after purchase.  Class C shares are
offered at net asset value  without an initial sales charge but are subject to a
CDSC upon  redemption of 1.00% during the first year and an annual  distribution
fee and  service  fee up to a maximum  of 1.00% per  annum.  Class I shares  are
offered at net asset value  without an initial  sales charge or CDSC and are not
subject  to a  distribution  or service  fee.  Class C and Class I shares do not
convert to any other class of shares of the Fund.

OTHER INFORMATION

     Eligible  Purchasers may purchase Class I shares only directly through MFD.
Eligible  Purchasers  may exchange Class I shares of the Fund for Class I shares
of any other MFS Fund  available  for purchase by such  Eligible  Purchasers  at
their net asset value (if available for sale),  and may exchange  Class I shares
of the Fund for shares of the MFS Money Market Fund (if available for sale), and
may redeem Class I shares of the Fund at net asset value.  Distributions paid by
the Fund with  respect to Class I shares  generally  will be greater  than those
paid with respect to Class A shares,  Class B shares and Class C shares  because
expenses  attributable  to Class A  shares,  Class B shares  and  Class C shares
generally will be higher.

     MFS has  agreed to bear,  for an  indefinite  period,  expenses  of Class I
shares of the Fund such that the aggregate expenses of the Fund's Class I shares
do not exceed 1.25% of the Fund's average daily net assets attributable to Class
I shares on an annualized  basis.  This arrangement may be terminated or revised
by MFS at any time.

                The date of this Supplement is September 1, 1997



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