This article will address the creative ways in which you can make your contracts more userfriendly while also planning for future addon provisions. This agreement (including any exhibits and schedules hereto) constitutes the entire agreement among the parties hereto.This article discusses how to best use exhibits, addenda, schedules, and amendments with real estate leases and other contracts. An addendum to a contract is essentially an update to an original agreement. They're typically included alongside a contract as an extra document. A new party to the agreement must simply fill out the joinder, sign it, and then deliver it to the company for their records. Exhibits, addenda, and schedules all can be attached to contracts. They should be agreed to before the contract is signed. Other Legal Requirements. On the other hand, if you are commissioned for a private artwork, for example, you might need to draw up and provide your own contract.