The above tackles the ethics of editing someone else's answer.
However, I currently have one user advising another to edit my answer as follows:
you could also just edit this answer to add clarifications. The original author will have chance to accept or reject the edits. That is often better for future readers than adding a different-but-same answer. – SRM 7 mins ago Does harmony have to be invented?
This is all very well but as far as I know, the system doesn't notify me if someone has added something to my answer.
How do I know if someone edits one of my answers. Maybe even years later?
(a) Does the system actively notify me?
(b) If not, where do I look to find out generally? (Other than returning to every single one of my answers to check?)