diff --git a/templates/default/header.html.ep b/templates/default/header.html.ep
index be33680..a76abc8 100644
--- a/templates/default/header.html.ep
+++ b/templates/default/header.html.ep
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="<%= $self->languages %>">
 <head>
   <title><%= $title %></title>
   <meta name="viewport" content="width=device-width, initial-scale=1"/>
