I was recently reviewing a first post and found a submitted answer which (as far as I can tell) does usefully contribute to a question and its accepted answer, phrased similarly to, "the accepted answer is correct but for this detail..." This post didn't constitute an answer to the original question, which obviously answers should do. However, the original poster also does not currently have enough reputation to even post a comment. Is there any action that should be taken in this case?
If my memory serves, I was once in this situation myself as a new contributor, and I noted in my answer that I knew I wasn't submitting a "real answer" but I still had something to say that I wished I could say as a comment, and that seemed to be received well/neutrally by the community (nobody told me to stop). That was handled well, I think. But if a user doesn't post such a disclaimer, should I follow up with them to inform them about how stuff works on StackExchanges?
Note that I'm not the person lacking the reputation to comment - I'm moderating first answers, and here I'm asking for guidance on how to make sure the person lacking the rep to post the comment understands what responses are answers and what responses are comments.