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Earlier today I flagged a post as duplicate on SO (route two parameters symfony2).

I intially left a comment saying something like:

Duplicate of: link to the question

I see this comment has now been deleted.
Is it not welcome to left a comment when a post is a duplicate of another one on top of flagging it?

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When the post has been closed as dup, I think the comment is also removed accordingly. – nhahtdh Apr 5 '13 at 2:26
Your comment was fine. Go back and look at the question. "Duplicate of" comments are converted to the text at the top when the question is closed. – Anthony Pegram Apr 5 '13 at 2:27
Ok I see. Just didn't know it works this way. Thanks! – cheesemacfly Apr 5 '13 at 2:29
up vote 3 down vote accepted

As others have said, comments with links to a master question are removed automatically by the system when the question is closed as a duplicate. A banner is added to the top of the question, containing a link to the master.

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