Add Description below Menu Title in Drupal 7

Hello! I've seen many posts about theme overrides to display the description beneath a menu item, but for those of us still becoming acquainted with theme overrides, it's a little difficult to translate (particularly because most solutions are for other modules or for Drupal 6). I found (http://drupal.org/node/470558) interesting, but it doesn't seem to apply for the most recent major Nice Menus release (7.x-2.1 at the time of this posting). This (http://fusiondrupalthemes.com/forum/using-fusion/descriptions-under-main...) also seemed on the right track, but I wasn't sure how to modify it for Nice Menus and my theme.

Could someone provide a short tutorial or example code for a theme override that displays the menu description below the Menu Title of the first level of the menu (not the drop-downs, but the one that is displayed on the page on load)? I'm currently using a Zen sub-theme in case that is an important aspect.

Thanks so much!