We have some code changes that need to be made because they were poorly written. basically, a developer looked at some old code and has found some areas of opportunity. They are going to modify the code to make it perform better. They created a project initiation document that says they are going to rewrite the code and now they want a requirements document. To me the only requirement is to streamline the code for better performance.

It seems a little over kill to try to put a requirements specification document together for this project (which has already been completed).

What do you tihnk? Any suggestions on how I should go about documenting this kind of project?