Addendum

Additional material attached to and made part of a document. If there is space insufficient to write all the details of a transaction on the sales contract form, the parties will attach an addendum or supplement to the document. The sales contract should incorporate the addendum by referring to it as part of the agreement. The addendum should refer to the sales contract and be dated and signed or initialed by all the parties.

In other documents, most importantly in contracts, an addendum is an additional document not included in the main part of the contract which may contain additional terms, specifications, provisions, standard forms or other information. A contract addendum may also be called an appendix or a rider. Addendums are often used in standard form contracts to make changes or add specific detail. For example, an addendum might be added to a contract to change a date or add details as to delivery of goods or pricing. The Addendum should be referenced in the contract, or the contract should be referenced in the addendum, so that it's clear to which contract the addendum is modifying.

Schedules and exhibits are sub-categories of addendums, with schedules being related to numerical and time information, such as pricing and time-schedules, and exhibits used for examples of standard forms and different types of evidence or models.

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