Possible Duplicate:
How do comment @replies work?
I fully expected to find this question already asked after typing it in, so if there is a duplicate somewhere please direct me to it...
I can't seem to tag some people in comments. I would have said that it was only people with spaces in their name, but I was actually able to tag someone with a space in their name just a minute ago.
@name
will be automatically removed if you're trying to notify the only other person in the conversation.