diff --git a/src/wp-includes/canonical.php b/src/wp-includes/canonical.php
index 11c513d31a..dfa6ec515d 100644
--- a/src/wp-includes/canonical.php
+++ b/src/wp-includes/canonical.php
@@ -32,6 +32,7 @@
  * @global bool $is_IIS
  * @global WP_Query $wp_query
  * @global wpdb $wpdb WordPress database abstraction object.
+ * @global WP $wp Current WordPress environment instance. 
  *
  * @param string $requested_url Optional. The URL that was requested, used to
  *		figure if redirect is needed.