As far as I can see it, all this would require is an addition in the privileges page of
What are comments?
Comments are temporary "Post-It" notes left on a question or answer.
They can be up-voted (but not down-voted) and flagged, but do not
generate reputation. There's no revision history, when they are
deleted they're gone for good and they're only editable for 5 minutes.
The information about them being only editable for 5 minutes seems far more important than revision histories or if deletions are permanent (still not that important, but more important). As such the existing level of detail supports this feature request.
Reasons for the inclusion of this information
- There are good reasons for the edit time being 5 minutes, however, it unquestionably inconveniences some people (e.g. correct a typo in a comment than has been replied to); knowing in advance is a better user experience than being hit by it after the event.
- Knowing in advance that you cannot edit your comments encourages people to take better care commenting in the first place
- Pragmatically; it stops people thinking it's a bug