Please comment the updated code

For those of us that customize and adapt some of the code, Would you please be so kind as to place update comments where the updated code is placed?

Even though I comment my changes, it would make life so much easier to handle manual updates if the code was commented. I understand that big upgrades wont likely have this, but security upgrades and/or added filters here and there are easy enough to comment to let us know where to find the changes.

Just a suggestion.