Index: wp-admin/includes/class-wp-terms-list-table.php
===================================================================
--- wp-admin/includes/class-wp-terms-list-table.php	(revision 21495)
+++ wp-admin/includes/class-wp-terms-list-table.php	(working copy)
@@ -276,7 +276,7 @@
 	}
 
 	function column_description( $tag ) {
-		return $tag->description;
+		return apply_filters( 'category_description', $tag->description );
 	}
 
 	function column_slug( $tag ) {