1
PROSPECTUS SUPPLEMENT                         This Prospectus Supplement,       
FOR THE PERIOD ENDING                         filed pursuant to Rule 424 (b)(3),
MAY 31, 1996 TO                               relates to Registration Statement 
PROSPECTUS DATED                              No. 33-38775-02 and the           
JULY 22, 1991                                 Prospectus dated July 22, 1991    



                       SECURITIES AND EXCHANGE COMMISSION
                             450 Fifth Street, N.W.
                            Washington, D.C.  20549


                                    FORM 8-K

                                 CURRENT REPORT

                     Pursuant to Section 13 or 15(d) of the
                        Securities Exchange Act of 1934


        Date of Report (Date of earliest event reported): June 17, 1996


                           DISCOVER CARD TRUST 1991 B
                           --------------------------
             (Exact name of registrant as specified in its charter)


Delaware                   0-19488                           Not Applicable
- --------                   -------                           --------------
(State of                  (Commission                       (IRS Employer
organization)              File Number)                      Identification No.)


c/o Discover Receivables Financing Group, Inc.
12 Read's Way
New Castle, Delaware                                   19720
- ------------------------------------------------------------
(Address of principal executive offices)             (Zip Code)

Registrant's telephone number, including area code: (302) 323-7826


                                 Not Applicable
                   ---------------------------------------
         (Former name or former address, if changed since last report)


                                Page 1 of 15
                       Index to Exhibits is on page 4
   2



Item 5. Other Events

On June 17, 1996 the Registrant made available the Monthly Certificateholders'
Statement for the Due Period of May 1996, which is attached as Exhibit 21
hereto.

Item 7.  Financial Statements and Exhibits

(c) Exhibits



Exhibit No.           Description
                   
21                    Monthly Certificateholders' Statement for Discover 
                      Card Trust 1991 B related to the Due Period ending 
                      May 31, 1996.






                                       2
   3



                                   SIGNATURES

    Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed
on its behalf by the undersigned, thereunto duly authorized.

                                     DISCOVER CARD TRUST 1991 B
                                            (Registrant)

                                     By: DISCOVER RECEIVABLES FINANCING
                                         GROUP, INC.
                                         as originator of the Trust


                                     By:        Birendra Kumar
                                         ----------------------------
                                         Birendra Kumar
                                         Vice President and Treasurer


Date: June 17, 1996





                                       3
   4



                                 EXHIBIT INDEX



Exhibit No.               Description
- -----------               -----------
                       
21                        Monthly Certificateholders' Statement for Discover 
                          Card Trust 1991 B related to the Due Period ending 
                          May 31, 1996.






                                       4