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How do comment @replies work?

Say, we've got an answer with some comments under it. Sometimes when I want to reply to one of the comments, I can easily refer to the comment author printing @ and starting to enter the author's name, that is autocompleted for me. But sometimes (if only one person gave comments or not...) I'm not suggested with any variant. Why is it so? On what terms does it depend?

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marked as duplicate by animuson, jonsca, kiamlaluno, Toon Krijthe, Pops Aug 22 '12 at 14:28

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.

Related: How do comment @replies work? – Adam Aug 22 '12 at 4:52
up vote 6 down vote accepted

It won’t autocomplete if the person you are answering is the owner of the post. Indeed, it will remove that if you try, after you submit the comment.

The reason for this behavior is that the owner of the post will always be notified anyway. Explicit notification would just waste space.

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Thank you, I guess I see now how it works – horgh Aug 22 '12 at 4:40
Oh no, not SE's precious space! How about the loss of meaning/comprehensibility that ensues by denying us use of the noun/directive in our sentence? Let US decide when we want to address the OP, thanks. It's like Nazi Germany around here. Oh, this is for you, @tchrist, lol. – alex gray Jan 30 at 2:19

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