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                        MFS(R) Union Standard Equity Fund
                      Supplement to the current Prospectus


The following sentence,  which appears in the second paragraph under the caption
"Investment  Objective  and  Policies-Investment  Policies"  on  page  6 of  the
Prospectus, is deleted in its entirety:

"The  Fund  generally  expects  to be fully  invested  in equity  securities  of
companies  contained  in the LSI and ETI  investments,  except for cash and cash
equivalent  investments and the investments and investment  techniques described
below."



                         The date of this Supplement is
                               December 18, 1997.



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