SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUSES

                                -----------------


Cash Account Trust                       Cash Reserves Fund Institutional
   Government & Agency                   DWS Money Market Prime Series
     Securities Portfolio                DWS Money Market Series
   Money Market Portfolio                NY Tax Free Money Fund
   Tax-Exempt Portfolio                  Tax-Exempt California Money Market Fund
Cash Management Fund                        Premier Shares
    Institutional                        Tax Free Money Fund Investment
Cash Reserve Fund, Inc.                     Premier Shares
   Prime Series

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Important Information Regarding Each of the Above-Noted Funds/Portfolios

The Funds/Portfolios listed above are participating in the U.S. Treasury
Department's (the "Treasury") Temporary Guarantee Program for Money Market Funds
(the "Program").

The Program is designed to protect the value of accounts in the Fund/Portfolio
as of the close of business on September 19, 2008. According to the terms of the
Program, any investment made by a shareholder after September 19, 2008 in excess
of the amount held in the account as of the close of business on that date will
not be covered by the Program. Any purchase of shares of the Funds/Portfolios
for an account opened after September 19, 2008 will also not be covered under
the Program. The Program guarantee will apply to the lesser of (i) the number of
shares held in an account as of the close of business on September 19, 2008, or
(ii) the number of shares held in the account on the date the Program guarantee
is triggered. Subject to certain conditions and limitations, the Program
guarantee is triggered if the Fund's/Portfolio's net asset value per share falls
below $0.995 -- which is commonly referred to as "breaking the buck" -- and the
Fund/Portfolio is liquidated. Guarantee payments under the Program will not
exceed the


May 1, 2009                                               [DWS INVESTMENTS LOGO]
MONEY-3606                                                   Deutsche Bank Group


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amount available within the Treasury's Exchange Stabilization Fund
("ESF") on the date of payment. As of February 28, 2009, ESF assets were
approximately $49.4 billion. The Treasury and the Secretary of the Treasury have
the authority to use assets from the ESF for purposes other than those of the
Program.

The Program had an initial three-month term after which the Treasury had the
option to renew the Program up to September 18, 2009. The Program was initially
in effect until December 18, 2008, was extended on November 24, 2008 until April
30, 2009, and was extended again on March 31, 2009 until September 18, 2009. The
Board of the Funds/Portfolios listed above approved continued participation in
the Program. The Treasury is not expected to extend the Program beyond September
18, 2009.

Each Fund/Portfolio will bear the expense of participating in the Program. The
expense born by a share class of a Fund/Portfolio is determined by the product
of: (i) the total shares outstanding of that particular share class as of
September 19, 2008 valued at $1.00; and (ii) the applicable Program
participation fee rate, which is based upon the market-based net asset value of
the outstanding shares of the applicable share class as of September 19, 2008.
For the initial period ending December 18, 2008, the Program participation fee
rate was equal to either 0.01% or 0.015%. For the Program extension from
December 19, 2008 and ending on April 30, 2009, the Program participation fee
rate was equal to either 0.015% or 0.022%. For continued coverage under the
Program beginning on May 1, 2009 and ending on September 18, 2009, the Program
participation fee rate is equal to either 0.015% or 0.023%.

Neither this prospectus supplement, the above-referenced prospectuses, DWS Funds
nor Deutsche Investment Management Americas Inc., the investment advisor, are in
any manner approved, endorsed, sponsored or authorized by the Treasury. As of
the date of this prospectus supplement, additional information about the
Program, including the consequences of a Fund's/Portfolio's triggering the
Program guarantee, is available at http://www.ustreas.gov.

               Please Retain This Supplement for Future Reference

May 1, 2009
MONEY-3606
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