> **Possible Duplicate:**  
> [Comment re-edit time-out is too short.. and Is there a limit on deleting my comments?](http://meta.askubuntu.com/questions/658/comment-re-edit-time-out-is-too-short-and-is-there-a-limit-on-deleting-my-comm)  

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I was surprised of this feature. What is it useful for?