October 3, 2001
To the Banks party
to the Credit Agreement
referenced below

Re:  AMENDED AND RESTATED  CREDIT  AGREEMENT,  dated as of November 7, 2000 (the
     "Credit  Agreement"),  among COMSTOCK RESOURCES,  INC. a Nevada corporation
     ("CRI"),  COMSTOCK OIL & GAS, INC., a Nevada corporation ("COG"),  COMSTOCK
     OIL & GAS -  LOUISIANA,  INC.,  a  Nevada  corporation  ("COGL"),  COMSTOCK
     OFFSHORE,  LLC, a Nevada limited liability company  ("Offshore") (CRI, COG,
     COGL and  Offshore  may  hereinafter  collectively  be  referred  to as the
     "Borrowers"), the lenders party hereto from time to time (collectively, the
     "Banks" and individually,  a "Bank"),  BNP PARIBAS,  as documentation agent
     for the  Banks  (in such  capacity,  the  "Documentation  Agent"),  TORONTO
     DOMINION  (TEXAS),  INC.,  as  syndication  agent  for the  Banks  (in such
     capacity,  the  "Syndication  Agent") and BANK ONE,  NA, as  administrative
     agent for the Banks (in such capacity, the "Agent").

Ladies/Gentlemen:

     The Borrowers hereby request, and Bank One, NA, as Agent, concurs, that the
Credit  Agreement shall be modified as follows:  Reference in Section 7.2(j) and
in 7.2(n) to "$10,000,000"  shall be deleted and  "$10,000,000  (except that for
the period from and including October 3, 2001 to and including December 31, 2001
such amount shall be increased to  $20,000,000,  provided  that if the aggregate
amount of all  Restricted  Payments and Optional  Indenture  Payments  since the
Effective  Date  exceeds  $10,000,000  (but does not exceed  $20,000,000)  after
December  31,  2001 no Event of Default  shall be deemed to have  occurred  as a
result  thereof,  but no  further  Restricted  Payments  or  Optional  Indenture
Payments may be made)" shall be substituted in each place thereof.

     Except as  modified  by the  above,  the  Borrowers  agree  that the Credit
Agreement  and all other Loan  Documents  are ratified and  confirmed  and shall
remain in full force and  effect,  and that they have no  setoff,  counterclaim,
defense or other claim or dispute with respect to any of the foregoing.  Each of
the  Borrowers  represents  and warrants to the Agent and the Banks that,  after
giving effect to this letter, the  representations  and warranties  contained in
the Credit Agreement and the other Loan Documents are true and correct on and as
of the date  hereof  with the same  force and effect as if made on and as of the
date hereof and that no Default or Event of Default  exists or has  occurred and
is continuing  on the date hereof.  All  capitalized  terms used but not defined
herein shall have the meanings ascribed thereto in the Credit Agreement.

     If the provisions of this letter are  acceptable to you,  please sign where
indicated  below.  This letter  shall be  effective  when signed by the Required
Banks and upon such  signature the Credit  Agreement  shall be deemed amended as
specified herein.  This letter may be executed in any number of counterparts and
telecopied signatures shall be effective as originals.

                        Very truly yours,

                        COMSTOCK RESOURCES, INC.

                        By: /s/ROLAND O. BURNS
                        Roland O. Burns , Senior Vice President

                        COMSTOCK OIL & GAS, INC.

                        By: /s/ROLAND O. BURNS
                        Roland O. Burns , Senior Vice President

                        COMSTOCK OIL & GAS, LOUISIANA, INC.

                        By: /s/ROLAND O. BURNS
                        Roland O. Burns , Senior Vice President

                        COMSTOCK OFFSHORE, LLC

                        By: /s/ROLAND O. BURNS
                        Roland O. Burns , Senior Vice President

                        Accepted and agreed:

                        BANK ONE, NA (Main Office Chicago)
                        as a Bank and as Agent

                        By:/s/THOMAS F. BOTH
                        Title: Director, Capital Markets

                        TORONTO DOMINION (TEXAS), INC.
                        as a Bank and as Syndication Agent

                        By:/s/ANN S. SLANIS
                        Title: Vice President

                        BNP PARIBAS
                        as a Bank and as Documentation Agent

                        By:/s/ A. DAVID DODD
                        Title: Vice President

                        By:/s/LARRY ROBINSON
                        Title: Vice President

                        FORTIS CAPITAL CORP.

                        By:/s/DARRELL W. HOLLEY
                        Title: Managing Director

                        By:/s/DEIRDRE SANBORN
                        Title: Vice President

                        CHRISTIANIA BANK OG KREDITKASSE, ASA

                        By:/s/WILLIAM PHILLIPS
                        Title: First Vice President

                        By:/s/ANGELA DOGANCAY
                        Title: Vice President

                        CREDIT LYONNAIS NEW YORK BRANCH

                        By:/s/ ATTILA KOC
                        Title: Sr. Vice President

                        GENERAL ELECTRIC CAPITAL CORPORATION

                        By: ______________________
                        Title: ___________________

                        BANK OF SCOTLAND

                        By:/s/ JOSEPH FRATIUS
                        Title: Vice President

                         NATEXIS BANQUES POPULAIRES

                         By:/s/ DONOVAN C. BROUSSARD
                         Title: Vice President

                         By:/s/ RENAUD J. D'HERBS
                         Title: Sr. Vice President and Regional Manager

                         NATIONAL BANK OF CANADA

                         By: /s/RANDALL WILHOIT
                         Title: Vice President

                         By: /s/DOUG CLARK
                         Title: Vice President