There's a link to the privileges page in the drop down menu that appears when you hover over your username (on the main site):


You need 50 points to be able to comment on any question or answer. You can comment on your own posts or answers to your own questions with 1 point.


You need 50 reputation to comment everywhere. You can comment on your own questions or answers or on other people's answers to your questions regardless of your reputation.

Only top voted, non community-wiki answers of a minimum length are eligible