Just been testing that friends description box Fencer, the adding works fine.
I think (maybe wrong) that Fiona (and a few others) meant that they could also add things to that box from the game with the person they were playing at the time and see what is in there also, so it would be like an extra Note box as such.
*added*
That way the person may not be a friend as such (not of your friends list), but someone you play and have got to know, who does not use there own name as there username, so when you got to a game with them a bow would show (in green maybe) with any details you have added about the person before, rather than going over it all again.