Where does the image description information show up on an item in a media gallery?

Does the description in a Media Gallery item show up anywhere or is that just the img tag attribute? I tried both the lightbox and the full page settings and the descriptions don't show up when I look at individual images. Here's a link to the gallery I am working on now. http://wcfia.harvard.edu/publications...

If it is just the attribute, I think it would be nice to allow users to add descriptive text to items in a media gallery and not limit to 255 characters. In our situation, almost any event image we put up would have to include a caption and a photo credit, and I would imagine that would be a common need. Without it, you end up just looking at a bunch of pictures with no context.
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