MFS MUNICIPAL INCOME FUND
                        (a series of MFS MUNICIPAL SERIES TRUST)

                        Supplement to be affixed to the current
                          Prospectus for distribution in Iowa

For Class B shares purchased after September 1, 1993,a contingent  deferred
sales charge  declining  from 4% to 0% will be imposed if the  investor  redeems
within six years from the date of purchase. In addition, the Class is subject to
an annual distribution and service fee of 1% of its average daily net assets.

                   The date of this Supplement is February 23, 1995.



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