This excerpt taken from the MRO 8-K filed Jun 16, 2005.
Section 16. Modification/Execution of General Release
This General Release may not be modified or cancelled in any manner except by a writing signed by both me and any member of the Marathon Group. It is not necessary that Marathon sign this General Release for it to become binding upon Marathon and me. This General Release shall be binding on the Marathon Group when it becomes irrevocable pursuant to Section 9.