OPPENHEIMER MUNICIPAL BOND FUND
497, 1998-05-27
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                         OPPENHEIMER MUNICIPAL BOND FUND
                      SUPPLEMENT DATED MAY 15, 1998 TO THE
                       PROSPECTUS DATED NOVEMBER 24, 1997

The Prospectus is changed as follows effective June 1, 1998:

1. Footnote number 1 under the table entitled "Shareholder Transaction Expenses"
on page 3 is modified to read as follows:

     (1) If you invest $1 million or more in Class A shares, you may have to pay
     a sales  charge of up to 1% if you sell  your  shares  within  18  calendar
     months from the end of the calendar month during which you purchased  those
     shares. See "How to Buy Shares -- Buying Class A Shares," below.

2. The second sentence of the paragraph entitled "Class A Shares" in the section
entitled "How to Buy Shares-Classes of Shares" on page 26 is modified to read as
follows:

     If you  purchase  Class A shares  as part of an  investment  of at least $1
     million  in shares of one or more  Oppenheimer  funds,  you will not pay an
     initial sales charge,  but if you sell any of those shares within 18 months
     of buying them, you may pay a contingent  deferred sales charge,  described
     below.

3. The first  and  second  sentences  of the  second  paragraph  of the  section
entitled  "Buying Class A  Shares-Class  A Contingent  Deferred Sales Charge" on
page 31 are modified to
read as follows:

     If you redeem any Class A shares subject to the  contingent  deferred sales
     charge described above within 18 months of the end of the calendar month of
     their  purchase,  a contingent  deferred  sales charge (called the "Class A
     contingent  deferred  sales  charge") may be deducted  from the  redemption
     proceeds.  (A different  holding period may apply to shares purchased prior
     to June 1, 1998).

4. The second sentence of the fourth  paragraph of the section  entitled "Buying
Class A Shares-Class A Contingent  Deferred Sales Charge" on page 31 is modified
to read as follows:

     However,  if the shares  acquired by exchange are redeemed within 18 months
     of the end of the calendar  month of the purchase of the exchanged  shares,
     the  contingent  deferred  sales charge will apply.  (A  different  holding
     period may apply to shares purchased prior to June 1, 1998).


                                    -1-                         (CONTINUED)

<PAGE>


5. The  paragraph  entitled  "Special  Arrangements  With Dealers" on page 31 is
hereby deleted.

6. The  following  sub-paragraphs  of the section  entitled  "Waivers of Class A
Sales  Charges-Waivers of the Class A Contingent Deferred Sales Charge Sales for
Certain Redemptions" on page 34 are
deleted:

         o if,  at the time of  purchase  of shares  (prior to May 1,  1997) the
     dealer  agreed in  writing  to accept  the  dealer's  portion  of the sales
     commission in  installments  of 1/18th of the  commission per month (and no
     further  commission  will be payable if the shares are  redeemed  within 18
     months of purchase)

         o if, at the time of  purchase  of shares (on or after May 1, 1997) the
     dealer  agrees in  writing  to accept  the  dealer's  portion  of the sales
     commission in  installments  of 1/12th of the  commission per month (and no
     further  commission  will be payable if the shares are  redeemed  within 12
     months of purchase)

7. The section captioned  "Special  Investor  Services" is revised by adding the
following after the subsection  captioned  "Shareholder  Transactions by Fax" on
page 39:

     OPPENHEIMERFUNDS  INTERNET WEB SITE.  Information about the Fund, including
     your  account  balance,  daily  share  prices,  market  and Fund  portfolio
     information,  may be obtained by visiting the OppenheimerFunds Internet Web
     Site, at the following  Internet address:  http://www.oppenheimerfunds.com.
     Additionally,   certain  account  transactions  may  be  requested  by  any
     shareholder  listed in the  registration  on an  account  as well as by the
     dealer  representative  of  record,  through a special  section of that Web
     Site.  To access  that  section of the Web Site,  you must  first  obtain a
     personal   identification   number  ("PIN")  by  calling   OppenheimerFunds
     PhoneLink at  1-800-533-3310.  If you do not wish to have Internet  account
     transactions  capability for your account, please call our customer service
     representatives  at  1-800-525-7048.  To find  out more  information  about
     Internet transactions and procedures, please visit the Web Site.






May 15, 1998                                                        PS0310.007


                                     -2-

<PAGE>


                         OPPENHEIMER MUNICIPAL BOND FUND
                      SUPPLEMENT DATED MAY 15, 1998 TO THE
          STATEMENT OF ADDITIONAL INFORMATION DATED NOVEMBER 24, 1997


The Statement of Additional  Information is changed as follows effective June 1,
1998:


      The third sentence of the fourth paragraph in the section entitled "How To
Exchange Shares" on page 46 is revised to read as follows:

      However,  if you redeem  Class A shares of the Fund that were  acquired by
      exchange of Class A shares of other Oppenheimer funds purchased subject to
      a Class A contingent  deferred sales charge within 18 months of the end of
      the calendar  month of the purchase of the exchanged  Class A shares,  the
      Class A contingent deferred sales charge is imposed on the redeemed shares
      (see "Class A Contingent  Deferred  Sales Charge" in the  Prospectus).  (A
      different  holding period may apply to shares  purchased  prior to June 1,
      1998).








May 15, 1998                                                        PX0310.004



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