Adding Comments to existing images

I was wondering if we could get the ability to add Comments to image files that already exist without them.


Drive Image used to have this function in it.


Only problem I see is the file size potential. I'd have to guess there may not be a way to alter just the Comments part of an image without resaving the entire image contents file(s). This, of course, would take a long time when Windows 8 images run about 35 GB, I think.


But, if it's possible without too many issues, I think it's a function worth having in Reflect.