It's really important that you did this, and even more important that you document that you did it. I know it probably seems obvious, but an agreement is more than a piece of paper that someone has signed. Written contracts _help_ to determine intention, but they can be superseded by oral contracts if the intention of the contract changes.

I once sat as a juror on a pretty nasty trial involving a contract where both parties disputed over the signature. We had to sit through days of testimony from professional handwriting forensics specialists over who they thought had signed a particular agreement. Was the signature valid, or was it forged?

In the end, it didn't matter. The two parties acted in such a way to form a different oral contract, and it was their actions which lead to the jury determining the outcome of the trial. The contract was a piece of the puzzle, but it's not the _only_ piece of the puzzle. One party acted in a way as to misrepresent what was in the written contract, and that was used to determine fault.