I posted an answer to a question but it turns out I had a major error in it. Another user posted a comment pointing out the error. I agree with the comment and so I deleted the answer. For SE in general now all is fine. But for the user who made the comment, this is somewhat tricky to see. If they check their own user profile the comment is now gone so they can't easily find the question again. An easy solution for this would be that you get a notice in your inbox saying something like 'An answer you commented on was deleted'. Then the user knows his comment was resolved.