Index: wp-signup.php
===================================================================
--- wp-signup.php	(revision 40984)
+++ wp-signup.php	(working copy)
@@ -350,6 +350,8 @@
  *
  * @since MU
  *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
  * @return null|bool True if site signup was validated, false if error.
  *                   The function halts all execution if the user is not logged in.
  */