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                         MFS UNION STANDARD EQUITY FUND
                                   A Series of
                            MFS Union Standard Trust

                 Supplement to the February 1, 1997 Prospectus


The second  sentence  under  "Investment  Objective  and  Policies -  Investment
Objective"  on page 6 of the  Prospectus is deleted and replaced in its entirety
with the following:

                "To the extent consistent with the Fund's objective of long-term
                growth  of  capital,  dividend  and  interest  income  may  be a
                consideration  of the Fund when  deciding  whether  to  purchase
                securities for its portfolio."


                  The date of this Supplement is May 2, 1997.



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