An addendum to a contract is a legally binding additional document that can be added to an existing contract. It is used to modify, clarify, or nullify a portion of the original document, typically by adding something new to the preexisting agreement or by extending the dates for which the contract is valid. Unlike an amendment, an addendum does not modify the existing terms of the contract, but rather it expands upon them
. For example, it can be used to add a deadline where none existed in the original version or to include supplementary information, such as additional terms, conditions, or provisions
. Once all parties named in a contract agree to an addendum, it becomes a part of the new contract
. An addendum should be signed or executed with the same formalities as the original document, unless the original document states otherwise
