MFS SUN LIFE SERIES TRUST
497, 2000-06-22
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                    MFS(R)/SUN LIFE SERIES TRUST: BOND SERIES

                      Supplement to the Current Prospectus

The  description  of portfolio  managers  under the  "Management  of the Series"
section is hereby restated as follows:

Geoffrey L.  Kurinsky,  a Senior Vice President of MFS, has been employed in the
investment  management area of MFS since 1987. Mr. Kurinsky has been the series'
portfolio  manager since 1998.  William Adams, a Vice President of MFS, has been
employed by MFS in the investment management area since 1997. Mr. Adams became a
portfolio manager of the series effective July 1, 2000.

                  The date of this Supplement is July 3, 2000.

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            MFS(R)/SUN LIFE SERIES TRUST: GLOBAL TOTAL RETURN SERIES

                      Supplement to the Current Prospectus

The  description  of portfolio  managers  under the  "Management  of the Series"
section is hereby restated as follows:

Frederick J. Simmons,  a Senior Vice  President of MFS, has been employed in the
investment  management area of MFS since 1971 and has been the fund's  portfolio
manager since 1994. Steven R. Gorham, a Vice President of MFS, has been employed
by MFS in the  investment  management  area since  1989 and  became a  portfolio
manager  of the fund  effective  May 1, 2000.  Mr.  Simmons  and Mr.  Gorham are
managers of the common stock portion of the fund's portfolio. Stephen C. Bryant,
a Senior Vice President of MFS, has been employed in the  investment  management
area of MFS since 1987 and became a portfolio manager of the fund effective July
1,  2000.  Mr.  Bryant is a manager  of the fixed  income  portion of the fund's
portfolio.


                  The date of this Supplement is July 3, 2000.



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