a way to update or correct an already posted comment/answer/info request

I'm pretty sure there isnt a way yet to do this, but it would be nice if users had the ability to update their own comments to questions asked in lauchpad answers. For comments/info requests/answers given, once you post the reply if there is a typo or you forgot to add something, said something wrong, wrong thread ect there is no way to correct it.

maybe allow users to edit their own comments/reply for a limited amount of time. 10 mins or something.

possible feature request.