diff --git a/app/templates/base.twig b/app/templates/base.twig
index 18b5e4725..e79e0891f 100644
--- a/app/templates/base.twig
+++ b/app/templates/base.twig
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 <head>
     <title>{% if title|default is not empty %}{{ title|striptags|raw }} - {% endif %}Piwik Analytics - Developer Docs - v{{ selectedPiwikVersion }}</title>
     <meta charset="utf-8">
