This module integrates the comment component JComments into JoomGallery. So JComments has to be installed on your site in order to use this module. JComments is a very feature rich comment system and offers much more convenience than JoomGallery's own comment system. With this module it is also possible to comment on categories not only images.
The module shows the categories and subcategories of the gallery in the way you know from a explorer showing a filesystem. It gives a quick overview of the total existing categories in the gallery and is ideally suited to quickly and easily navigate between them.