This approach does not affect all conditions and provisions that are not expressly addressed in the text of the addendum and are deemed binding for the duration of the amended contract. @hamje32 – A legal agreement in which you often see additions and additions is a law passed by Congress. The amendments, as they are called in this context, are self-evident. I think that makes sense. Whether the endorsements are good or not depends, in my view, on the nature of the agreement and the product or service in question. @hamje32 – I consulted software in passing. I like to have things written down, so I make an advisory contract between myself and the client. Amendments are legally binding documents that amend treaties already in force. . . .