MFS SERIES TRUST X, 497, 1998-01-13

MFS SERIES TRUST X
497, 1998-01-13

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                     MFS(R) GOVERNMENT MORTGAGE FUND

                    Supplement to the Current Prospectus


The  description  of  portfolio  manager  under  the  "Management  of the Fund -
Investment  Adviser" section is hereby revised as follows:  Beginning January 1,
1998, D. Richard Smith is the portfolio  manager of the Fund.  Mr. Smith, a Vice
President  of the  Adviser,  has been  employed as a portfolio  manager with the
Adviser  since 1993.  Prior to 1993,  Mr. Smith was a Vice  President at Salomon
Brothers, Inc.

                The date of this Supplement is January 1, 1998.