I answered this question. I also wanted to add a comment on another one, but I am unable to do so. Why?
EDIT: The problem is I do not see the usual add comment link, I only see suggest improvements
We are currently doing an experiment where users are encouraged to suggest improvements, rather than leave comments. Comments on this site work differently than others. They are supposed to be only for suggesting improvements or requesting clarification.
We are trying to see if by making the text say "suggest improvements" rather than "add a comment" we would get more productive and less chatty comments. The functionality is exactly the same.