Changing the unit description text

[rejenorst 18]

i saw a thread about this a while back but couldn't find it again.

When you hold your gun/corsshairs over a particular unit such as a milita for example, you tend to see a text appear that says militia and the number of meters far he is. Can I make my own text for particular units without making an addon? Do I have to make a config? If so can I load the config into the mission without requiring players to install it into their arma2 directories?

Thank you.