In StackOverflow, I always wanted the ability to edit my comments. Previously I used to delete them and write a new one.
Suddenly today, I started noticing edit link next to my comments. Maybe I didn't notice till now.
But it is there only for some of my comments and not others. Why is it so?
Now, some of those edit links are gone. Is the comment editable only for a certain amount of time after writing it?