[Wlug] Make the diffrence!

Hi all, Can you please tell me how can I make a line that will not proccessed in file named /etc/passwd. There are so many users in my machine, what I want to do is I want to clasisfication the user with a defined title, so by this, I can easily see where the user is according the definition that I'll make. Eg in file /etc/passwd I want to make like this # Europe - Jakarta # South Asia - Jakarta # Australia - Jakarta I want to put that words as comment in file /etc/passwd Can you friends tell me how to make it ? Thanks.