Sure!
But just to clarify: When you say stuffed into the end of the main document do you mean at the end of the downloadable PDF?
A changelog in the end of the main PDF, or in a separate downloadable file would be useful. The advantage of stuffing into the end of the downloadable PDF is you'd only need one file. However, If you were to make a second file to be a dedicated changelog, it would keep the main PDF smaller and more print-friendly to new players that wouldn't need/want the changelog.