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How do comments work?

I had a comment edited, and an apology to the moderator who I assume made the edit removed this afternoon. I assume that I crossed some kind of line with the original, and the apology removed as off topic, but I don't really know for sure.

I've read FAQs on posting questions, but have never seen one for comments, so I was wondering if there was a guide or FAQ to for comments that I could read so I would would be able to avoid this in the future.

Edit - To be clear, I am not disagreeing with the moderation in any way, I simply want to be more clear on the ground rules to participate in the community.

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marked as duplicate by Pops, Cody Gray, kiamlaluno, Gilles, ChrisF Mar 20 '12 at 12:58

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Comments should generally be topical, and of course courteous. Accept-rate badgering comments are terminated with extreme prejudice. Other comments may be considered obsolete after a brief period. What type of comment did you have removed or edited? – Anthony Pegram Feb 27 '12 at 20:53
@AnthonyPegram I gently chastised a new user for bringing requirements that should have been in the question later in a response to an answer. I didn't think I was over the line at the time, which prompted me to ask this question here on meta. – asawyer Feb 27 '12 at 20:55
So for context, it was your comment on this answer? – Anthony Pegram Feb 27 '12 at 20:58
@AnthonyPegram Yes sir. – asawyer Feb 27 '12 at 20:59
I think you're looking for How do comments work?, which is an official [faq] entry. You may also want to read the other posts that come up when you search for [faq] comments. – Pops Feb 27 '12 at 21:12

Comments are generally supposed to be temporary; one of the options when flagging a comment is "obsolete". Most likely the mod saw your apology comment, at which point the comment was no longer necessary, so he just deleted it. I can't see your original comment, so I don't know what you said that warranted editing, but I wouldn't really worry about it; it couldn't have been too bad or the mod would've said something. There isn't any special guide to etiquette in comments, although there is one for posting in general in the FAQ

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In general, comments are used to clarify a post. They have no other "official" function.

It is rare, but if I encounter a comment that makes a valid point of clarification but is borderline rude, rather than delete the comment, I will just remove the offending words.

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