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                        MFS(R) Government Securities Fund

          Supplement to the Current Statement of Additional Information


         Part I of the MFS Government  Securities Fund's Statement of Additional
  Information,  dated  July 1, 1999 as amended  September  21,  1999,  is hereby
  revised by amending the first  paragraph of Section VII entitled,  "Investment
  Techniques, Practices and Risks", to add the following percentage limitation:

               o    Collateralized  Mortgage  Obligations  may be up to (but not
                    including) 20% of the Fund's assets.


                 The date of this Supplement is January 5, 2000.



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