Changelogs?

Sure you need to stick in some changelog entries if you're modifying the others' code, but I thought it was a requirement to maintain your own changelogs for every file, including the ones the patch just adds (since DST is mostly a chunk of brand new code, right?) If the original statement was merely about the fact that you need to acknowledge changing the work of others with a brief description of what you've changed there, then that's surely understandable and is of course required.