MFS SERIES TRUST I
497, 2000-03-01
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                          MFS(R) STRATEGIC GROWTH FUND

            Supplement dated March 1, 2000 to the Current Prospectus

This Supplement  describes the fund's Class J Shares, and it supplements certain
information in the fund's Prospectus dated January 1, 2000. The caption headings
used in  this  Supplement  correspond  with  the  caption  headings  used in the
Prospectus.

Class J shares are available for purchase  only by Japanese  investors.  Class J
shares may only be offered or sold outside the United States and this supplement
does not  constitute an offer of class J shares to any person who resides within
the United States.

1.   EXPENSE SUMMARY

     Expense Table. The "Expense Table" describes the fees and expenses that you
     may pay when you buy,  redeem  and hold  shares of the  fund.  The table is
     supplemented as follows:

     Shareholder Fees (fees paid directly from your investment)
                                                                       Class J
       Maximum Sales Charge (Load) Imposed on Purchase
        (as a percentage of offering price)..........................  3.00%(1)

       Maximum Deferred Sales Charge (Load) (as a percentage or original
         purchase price or redemption proceeds, whichever is less)...   None

    Annual Fund Operating Expenses (expenses that are deducted from fund assets)

              Management Fees                                          0.75%
              Distribution and Service (12b-1) Fees                    1.00%
              Other Expenses(2) (3)                                    0.28%
                                                                       -----
              Total Annual Fund Operating Expenses                     2.03%
- -----------------------
(1)    Class J shares  are sold in Japan  through  financial  institutions.  The
       sales  charge  (load)  paid by an  investor  differs  depending  upon the
       financial institutions through which the investment is made, but will not
       exceed 3%. These sales charges  (loads) are fully disclosed in the Fund's
       Japanese  prospectus,  which is  provided to  investors  upon sale of the
       fund's Class J shares.

(2)    The fund has an  expense  offset  arrangement  which  reduces  the fund's
       custodian  fee based upon the amount of cash  maintained by the fund with
       its custodian and dividend  disbursing  agent and the fund may enter into
       other similar  arrangements and directed  brokerage  arrangements  (which
       would  also have the effect of  reducing  the  fund's  expenses).  "Other
       Expenses"  do  not  take  into  account  these  expense  reductions,  and
       therefore do not represent the actual expenses of the fund.

(3)    "Other Expenses" are estimated for the current fiscal year.

         Example of Expenses.  The  "Example of  Expenses"  table is intended to
     help  you  compare  the  cost of  investing  in the  fund  with the cost of
     investing in other mutual funds.

        The example assumes that:

          o    You invest $10,000 in the fund for the time periods indicated and
               you redeem your shares at the end of the time periods;

          o    Your investment has a 5% return each year and dividends and other
               distributions are reinvested; and

          o    The fund's operating expenses remain the same.

The table is supplemented as follows:


             Share Class            Year 1          Year 3
             -----------            ------          ------
             Class J shares          $402            $824
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2.   DESCRIPTIONS OF SHARE CLASSES

     Five classes of shares of the fund currently are offered for sale,  class A
shares, class B shares, class C shares, class I shares and class J shares. Class
A shares, class B shares, class C shares and class I shares are described in the
fund's  prospectus  and are available  for purchase by the general  public or by
certain institutional investors. Class J shares are described below.

         Class J Shares.  Class J shares are  offered  exclusively  to  Japanese
investors through financial institutions in Japan. Class J shares are offered at
net asset value plus a maximum initial sales charge as follows:

                                            Sales Charge as Percentage of:

         Amount of Purchase            Offering Price       Net Amount Invested

             All amounts                        3.00%                  3.09%

         Distribution  and Service Fees. The fund has adopted a plan under 12b-1
that  permits  it to pay  marketing  and  other  fees to  support  the  sale and
distribution  of J shares and the  services  provided  to you by your  financial
institution. The class J annual distribution and service fees are equal to 1.00%
(0.25% service fee and 0.75%  distribution  fee), and are paid out of the assets
of class J shares. These fees are paid to MFD by the fund, and MFD in turns pays
a portion of these fees to dealers.

3.   HOW TO PURCHASE, EXCHANGE AND REDEEM SHARES

The discussion of "How to Purchase,  Exchange and Redeem Shares" is supplemented
as follows:

         How to Purchase  Shares.  You can  establish  an account by having your
financial institution process your purchase.  The minimum initial investment and
the minimum  subsequent  investment  amounts differ depending upon the financial
institution  through  which the  investment  is made.  These  minimums are fully
disclosed in the fund's Japanese prospectus, which is provided to investors upon
sale of the fund's class J shares.

         How to Purchase  Shares.  You can  establish  an account by having your
financial institution process your purchase.  The minimum initial investment and
the minimum  subsequent  investment  amounts differ depending upon the financial
institution  through  which the  investment  is made.  These  minimums are fully
disclosed in the fund's Japanese prospectus, which is provided to investors upon
sale of the fund's class J shares.

         How to  Exchange  Shares.  Exchanges  of class J shares of the fund for
class J shares  of other MFS  funds is  permitted  only if the funds are sold in
Japan  through  the same  distributor  and the  distributor  permits  exchanges.
Exchange privileges are fully disclosed in the fund's Japanese prospectus, which
is provided to investors upon sale of the fund's class J shares.

         How to Redeem Shares.  You may withdraw all or any portion of the value
of your account on any date the fund is open for business by selling your shares
to the fund  through a financial  institution,  who may charge you a fee. If the
financial  institution receives your order prior to the close of regular trading
on the New York Stock  Exchange and  communicates  it to MFS before the close of
the business on the same day, you will receive the net asset value calculated on
that day, reduced by an amount of any income tax required to be withheld.


4.   INVESTOR SERVICES AND PROGRAMS

     The shareholder services,  as described in the Prospectus,  do not apply to
class J shares,  except that shareholders will receive  confirmation  statements
and tax information.



                  The date of this Supplement is March 1, 2000.



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