It's very common to ask for additional information on a question. This is perhaps most common with new users who are a little unfamiliar with the need to put all relevant information in their question to start with.
To be blunt, I'm a little tired of explaining to new users that an edit is better than a comment, particularly where we ask "please add the output of..." I note that some users have taken to explicitly asking OPs to edit their question and adding an edit link in their comment. But still this is missed.
More recently, adding a comment to a new user's question displays a little note saying:
... is a new contributor. Be nice, and check out our Code of Conduct.
Could there be a similarly formatted note to new contributors commenting on their own question or answer:
If you need to add more information please edit your [question][answer] instead of adding a comment.