Final expression: parol or extrinsic evidence.

Del. Code tit. 6, § 2-202
in effect
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Terms with respect to which the confirmatory memoranda of the parties agree or which are otherwise set forth in a record 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 (§ 1-303); and (b) By evidence of consistent additional terms unless the court finds the record to have been intended also as a complete and exclusive statement of the terms of the agreement.
Source: DE Code (Official Site)URL: https://delcode.delaware.gov/title6/c002/sc02/index.htmlFetched: 10/4/2026