I've gotten past this on stackexchange because as a developer I have more to say about programming, but I often run into superuser type issues and find the knowledge here to be quite handy as well.
In researching, the only way to comment here (for me) appears to be submitting another separate answer as a comment, but this is fail because the user you are trying to comment to may not get any notification. It is also fail because it is abusing the answer question privilege and people get downvoted for doing this. I come to superuser for help but find it incredibly hostile and difficult to use when I can't even reply to people.
If I can answer a question at 1 rep, surely I should be able to add something useful via comment to another answer, no?