Civil Code § 1697
CHAPTER 3. Modification and Cancellation
A contract not in writing may be modified in any respect by consent of the parties, in writing, without a new consideration, and is extinguished thereby to the extent of the modification.
CHAPTER 3. Modification and Cancellation
A contract not in writing may be modified in any respect by consent of the parties, in writing, without a new consideration, and is extinguished thereby to the extent of the modification.