It is now sometime, when Facebook allowed us to edit any comment we make.
From today I’m seeing this new option, which allows anyone to see the Edition made to any comment. The feature rolls out to me today.
Here are the screen shot:
Anyone who can see the comment, can see what changes have been made.
See the screenshot below, when I clicked on the Edited.
Earlier when Facebook allowed anyone to make edition to the comment. People sometimes were editing comments after days and weeks, so Facebook now let the followers (or anyone who can see comment) see the Edited history of the comment.