December 19, 2002

                DREYFUS STOCK INDEX FUND, INC.

      Supplement to Statement of Additional Information
                      dated May 1, 2002



      At a special meeting of shareholders held on December 18,
2002, shareholders approved certain changes to the Fund's
investment restrictions to permit the Fund to invest in
securities of other investment companies and lend its portfolio
securities to the extent permitted under the Investment Company
Act of 1940, as amended (the "1940 Act"), as described below.
Accordingly, the following information supplements and supersedes
any contrary information contained in the Fund's Statement of
Additional Information.

Certain Portfolio Securities

      Investment Companies.  The Fund may invest in securities
issued by other investment companies.  Under the 1940 Act, the
Fund's investment in such securities, subject to certain
exceptions, currently is limited to (i) 3% of the total voting
stock of any one investment company, (ii) 5% of the Fund's total
assets with respect to any one investment company and (iii) 10%
of the Fund's total assets in the aggregate.  Investments in the
securities of other investment companies may involve duplication
of advisory fees and certain other expenses.  The Fund also may
invest its uninvested cash reserves or cash it receives as
collateral from borrowers of its portfolio securities in
connection with the Fund's securities lending program, in shares
of one or more money market funds advised by Dreyfus.  Such
investments will not be subject to the limitations described
above, except that the Fund's aggregate investment of uninvested
cash reserves in such money market funds may not exceed 25% of
its total assets.  See "Lending Portfolio Securities."

Investment Techniques

      Lending Portfolio Securities.  The Fund may lend securities
from its portfolio in an amount not to exceed 33-1/3% of the
value of the Fund's total assets (including the value of all
assets received as collateral for the loan).  The Fund will
minimize this risk by limiting the investment of cash collateral
to money market funds advised by Dreyfus, repurchase agreements
or other high quality instruments with short maturities.

Investment Restrictions

      Investment Restriction Nos. 2 and 6 now read as follows:

           The Fund may not:

           2.   Purchase securities of other investment
           companies, except to the extent permitted
           under the 1940 Act.

           6.   Lend any securities or make loans to
           others, except to the extent permitted under
           the 1940 Act (which currently limits such
           loans to no more than 33-1/3% of the value of
           the Fund's total assets) or as otherwise
           permitted by the Securities and Exchange
           Commission.  For purposes of this Investment
           Restriction, the purchase of debt obligations
           (including acquisitions of loans, loan
           participations or other forms of debt
           instruments) and the entry into repurchase
           agreements shall not constitute loans by the
           Fund.  Any loans of portfolio securities will
           be made according to guidelines established
           by the Securities and Exchange Commission and
           the Fund's Board.

      Investment Restriction No. 2 is now a non-fundamental policy
which may be changed by the Fund's Board members at any time
without shareholder approval.  The Fund and Dreyfus have received
an exemptive order from the Securities and Exchange Commission
which, among other things, permits the Fund to use cash
collateral received in connection with lending the Fund's
securities and other uninvested cash to purchase shares of one or
more registered money market funds advised by Dreyfus in excess
of limitations imposed by the 1940 Act.

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