This could be possible with a mouseover description, simply throw the description into the "title" property of the <a> element.

e.g.

url: http://howtowriteagoodemo.com/consider.html

title: How to make a demo that people will truly consider

description: Gives good tips on the small things that keep people interested in your demo.

This would result in --

<a href="http://howtowriteagoodemo.com/consider.html" title="Gives good tips on the small things that keep people interested in your demo.">How to make a demo that people will truly consider</a>