Index: taxonomy_super_select.module
===================================================================
--- taxonomy_super_select.module	(revision 280)
+++ taxonomy_super_select.module	(working copy)
@@ -198,7 +198,8 @@
         '#title' => ($term->is_parent ? '<strong>' : '') . check_plain($term->name) . ($term->is_parent ? '</strong>' : ''),
         '#return_value' => $term->tid,
         '#default_value' => $value,
-        '#weight' => ($fieldweight >= 0) ? $fieldweight : $term->weight,       
+        '#weight' => ($fieldweight >= 0) ? $fieldweight : $term->weight,
+        '#attributes' => array('title' => $term->description),
       );
     break;
   }