See how to describe assets in your Vizible Asset Library so that users can get information about it.
When hovering over an asset thumbnail, some basic information about it is displayed. One piece of information, the description, is editable to better convey details about the asset.
Select the Assets tab.
Click on the asset that will have its description changed.
Click on the gear icon in the lower left.
Enter the description text in the bottom box.
Press OK to save the changed.
Hover the mouse cursor over the asset and the description text will pop up