Connecticut General Statutes Title 42A. Uniform Commercial Code § 42a-2-202 § 42a-2-202. Final written expression:  Parol or extrinsic evidence

Terms with respect to which the confirmatory memoranda of the parties agree or which are otherwise set forth in a writing intended by the parties as a final expression of their agreement with respect to such terms as are included therein may not be contradicted by evidence of any prior agreement or of a contemporaneous oral agreement but may be explained or supplemented (a) by course of performance, course of dealing or usage of trade as provided by section 42a-1-303;  and (b) by evidence of consistent additional terms unless the court finds the writing to have been intended also as a complete and exclusive statement of the terms of the agreement.