diff --git a/core/includes/common.inc b/core/includes/common.inc
index aea8529..c3a580d 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -4833,6 +4833,10 @@ function drupal_get_private_key() {
  *
  * @param $value
  *   An additional value to base the token on.
+ *
+ * @return string
+ *   A 43-character token. This string will always be the same for a given
+ *   $value on the same site.
  */
 function drupal_get_token($value = '') {
   return drupal_hmac_base64($value, session_id() . drupal_get_private_key() . drupal_get_hash_salt());