diff --git a/router.php b/router.php
index 96b8264..133a07d 100644
--- a/router.php
+++ b/router.php
@@ -62,7 +62,7 @@ function logAccess($status = 200) {
 ?>
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
 <HEAD>
   <TITLE>Index of <?=$this_dir?></TITLE>
 </HEAD>
