Wikimedia Bugzilla is closed!

I was using wikipedia and thought it would be useful if when hovering over an
internal link (one that points back to wikipedia) that there was some way to
provide a brief definition or description of the target page.  

So, for instance, I am looking at the Macrophage article and I see a link to the
Monocyte article.  When I hover my mouse over the link it says "Monocyte".  This
isn't tremendously useful.  I know that the author of the Macrophage page could
specify the tool tip, but it would be more convenient if there were a way to
define a generic tool tip in the Monocyte page, that provides a brief
description that will appear as a tool tip in any page that links to it.  Thus
saving the linking pages author the effort of reproducing content from the
linked to page.  I suppose it should be overridable by the linking author.

My apologies if I have overlooked this feature.  I have never seen it used.