MFS SERIES TRUST I, 497, 1997-09-30

MFS SERIES TRUST I
497, 1997-09-30

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                            MFS STRATEGIC GROWTH FUND

                      Supplement to the Current Prospectus


         During the  period  from  October 1, 1997  through  December  31,  1997
(unless extended by MFS Fund  Distributors,  Inc. ("MFD")) (the "Sales Period"),
MFD will pay Cadaret Grant & Co., Inc.  100% of the  applicable  sales charge on
sales of Class A shares of the Fund sold by them  during  the Sales  Period.  In
addition,  MFD will pay Cadaret Grant & Co., Inc. an additional commission equal
to 0.50% of the net asset value of all of the Class B shares of the Fund sold by
them during the Sales Period.



                The date of this Supplement is October 1, 1997.