Comments are visible only to the author of the topic.

I think everyone is already tired of comments like "You have a typo ...", or something like that. Not bearing the semantic load on the topic topic, and after correcting the error of the de facto hanging dead weight. Therefore, there was an idea to add functional comments visible only for the author of the topic. In addition, it will help to conduct one-on-one discussions on the topic, since the private messages for this case are not very convenient, and sometimes it is necessary to discuss some things confidentially and in this format. (Of course, I understand there is Jabber \ ICQ and so on, but I think there would be something like that too)