diff --git a/lektor/lektordata/project/templates/layout.html b/lektor/lektordata/project/templates/layout.html
index a69ba40..c5712c8 100644
--- a/lektor/lektordata/project/templates/layout.html
+++ b/lektor/lektordata/project/templates/layout.html
@@ -1,4 +1,5 @@
 <!doctype html>
+<html lang="de">
 <meta charset="utf-8">
 <link rel="stylesheet" href="{{ '/static/style.css'|url }}">
 <link rel="icon" type="image/png" href="{{ '/favicon-96x96.png'|url }}" sizes="96x96">
@@ -62,3 +63,4 @@
     </div>
   </footer>
 </body>
+</html>
\ No newline at end of file
