diff --git common.inc common.inc
index abaf7a9..fe07b05 100644
--- common.inc
+++ common.inc
@@ -2256,6 +2256,7 @@ function drupal_attributes(array $attributes = array()) {
  *     internal to the site, $options['language'] is used to determine whether
  *     the link is "active", or pointing to the current page (the language as
  *     well as the path must match). This element is also used by url().
+ *   - 'class': Array of optional css classes to add to the link.
  *   - Additional $options elements used by the url() function.
  *
  * @return