CO-ADMINISTRATION AGREEMENT

                                February 28, 2006

State Street Bank and Trust Company
  One Federal Street, 9th Floor
Boston, Massachusetts 02206

Dear Sirs:

                  In accordance with Section 1 of the Co-Administration
Agreement, dated March 18, 2002 (the "Agreement"), by and among each investment
company party to that certain Agreement with State Street Bank and Trust Company
("SSB"), the Credit Suisse Trust (the "Trust") hereby notifies SSB of the
Trust's desire to amend Appendix A of the Agreement to include the Commodity
Return Strategy Portfolio ("the Portfolio"), and to have SSB render services as
administrator under the terms of the Agreement with respect to the Portfolio.

                  Please confirm that the foregoing is in accordance with your
understanding by indicating your acceptance hereof at the place below indicated,
whereupon it shall become a binding agreement between us.

                                         Very truly yours,

                                         By: /s/ J. Kevin Gao
                                            -----------------------------------
                                            Name: J. Kevin Gao
                                            Title: Vice President and Secretary

Accepted:

STATE STREET BANK AND TRUST COMPANY

By:_________________________________
   Name:
   Title: