how to tag people on facebook photo's?

[CityWok]

hey sometimes on photo's which have been posted by people on facebook in the comments people link their friends names and tag them how do they do it? they dont take them in the photo but in the comments they can link their friends name which their friends can see the photo.

thanks

[noone]

Sometimes a white square will appear around the head of person in the photo. Move your mouse toward that and it will give you a list of names and type or click it in