--- a/wp/wp-includes/vars.php	Mon Jun 08 16:11:51 2015 +0000
+++ b/wp/wp-includes/vars.php	Tue Jun 09 03:35:32 2015 +0200
@@ -6,15 +6,18 @@
  * for the browser to set which one is currently being used.
  *
  * Detects which user environment WordPress is being used on.
- * Only attempts to check for Apache and IIS. Two web servers
- * with known permalink capability.
+ * Only attempts to check for Apache, Nginx and IIS -- three web
+ * servers with known pretty permalink capability.
+ *
+ * Note: Though Nginx is detected, WordPress does not currently
+ * generate rewrite rules for it. See https://codex.wordpress.org/Nginx
  *
  * @package WordPress
  */
 
 global $pagenow,
 	$is_lynx, $is_gecko, $is_winIE, $is_macIE, $is_opera, $is_NS4, $is_safari, $is_chrome, $is_iphone, $is_IE,
-	$is_apache, $is_IIS, $is_iis7;
+	$is_apache, $is_IIS, $is_iis7, $is_nginx;
 
 // On which page are we ?
 if ( is_admin() ) {