diff --git a/external-permalinks-redux.php b/external-permalinks-redux.php
index a305141623615903c6a4a30d3956218a469eb1fb..ce48f77fa4a5d429abc923ee5003916c1405ad99 100644
--- a/external-permalinks-redux.php
+++ b/external-permalinks-redux.php
@@ -205,7 +205,10 @@ class external_permalinks_redux {
 	/**
 	 * Redirect to external link if object requested directly.
 	 *
+	 * @global $post
+	 * @uses is_singular
 	 * @uses get_post_meta
+	 * @uses apply_filters
 	 * @uses wp_redirect
 	 * @action pre_get_posts
 	 * @return null