You will receive a notification only if someone answers your comment by using a @yourname comment reply.
Not everyone uses it though, so I suggest you use it even when you don't need it. For example, even if you know the person who posted the answer you comment on will get notified, use the @hisname when you write your comment, to suggest it's the way he got notified, so he will use it too (not needed with a regular user though, but it can help with new ones).
