Commenting feature can be used, but it is not easy to view those comments without finding the specific photo.
Being able to use that comment feature as a note to myself on both the original and edited file. Currently I do it by uploading the photo to Flickr, where I have a Pro account, so I can keep the photo and associated notes private. It is double work as I use the tools for different things.
A simple view adjustment may be sufficient.
Thank you.