Exhibit (e)(13)

                        DISTRIBUTION AGREEMENT SUPPLEMENT
                               The RBB Fund, Inc.

                    Bear Stearns CUFS MLP Mortgage Portfolio

                  This supplemental agreement is entered into this 17th day of
October, 2006, by and between THE RBB FUND, INC. (the "Company") and PFPC
DISTRIBUTORS, INC. (the "Distributor").

                  The Company is a corporation organized under the laws of the
State of Maryland and is an open-end management investment company. The Company
and the Distributor have entered into a Distribution Agreement, dated as of
January 2, 2001 (as from time to time amended and supplemented, the
"Distribution Agreement"), pursuant to which the Distributor has undertaken to
act as distributor for the Company, as more fully set forth therein. Certain
capitalized terms used without definition in this Distribution Agreement
Supplement have the meaning specified in the Distribution Agreement.

                  The Company agrees with the Distributor as follows:

                  1. ADOPTION OF DISTRIBUTION AGREEMENT. The Distribution
Agreement is hereby adopted for the Bear Stearns CUFS MLP Mortgage Portfolio
Class of Common Stock of the Company (the "Class").

                  2. PAYMENT OF FEES. For all services to be rendered,
facilities furnished and expenses paid or assumed by the Distributor on behalf
of the Class as provided in the Distribution Agreement and herein, the Company
shall pay the Distributor no compensation.

                  3. COUNTERPARTS. This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

                  IN WITNESS WHEREOF, the undersigned have entered into this
Agreement, intending to be legally bound hereby, as of the date and year first
above written.

THE RBB FUND, INC.                            PFPC DISTRIBUTORS, INC.


By:      /s/ Edward J. Roach                  By:      /s/ Bruno DiStefano
         ----------------------------                  -------------------------
Name:    Edward J. Roach                      Name:    Bruno Di Stefano
Title:   President                            Title:   Vice President