Mass. Gen. Laws ch. 106, § 1-306: Waiver Or Renunciation Of Claim Or Right After Breach

Section 1–306. A claim or right arising out of an alleged breach may be discharged in whole or in part without consideration by agreement of the aggrieved party in an authenticated record. For purposes of this section, a party may ''authenticate'' a record by: (i) signing a record that is a writing; or (ii) attaching to or logically associating with a record that is not a writing an electronic sound, symbol or process with the present intent to adopt or accept the record.