SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUSES
AND SUMMARY PROSPECTUSES:
     
     
Cash Management Fund
Cash Reserve Fund — Prime Series
Cash Reserves Fund Institutional
DWS Money Market Series


 
Effective immediately, the fund may not lend portfolio securities. Therefore, all references to the fund’s policy of permitting the lending of securities and to the associated risks are hereby deleted.
 
Please Retain This Supplement for Future Reference
 
September 24, 2010
PS-3600

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