EXHIBIT 4.15 Coda Energy, Inc. hereby agrees to furnish supplementally a copy of any omitted schedule to the Shareholder Agreement or the Stockholders Allocation Agreement to the Commission upon request.

 
                                                                    EXHIBIT 4.15

Coda Energy, Inc. hereby agrees to furnish supplementally a copy of any omitted
schedule to the Shareholder Agreement or the Stockholders Allocation Agreement
to the Commission upon request.