diff --git a/_layouts/index.html b/_layouts/index.html
index df3e92f..1e945d2 100644
--- a/_layouts/index.html
+++ b/_layouts/index.html
@@ -1,5 +1,5 @@
 <!doctype html>
-<html>
+<html lang="{{ site.lang | default: 'en-US' }}">
 <head>
 {% include meta.html %}
 <link rel="stylesheet" type="text/css" href="{{ '/assets/css/page.css' | relative_url }}"/>
diff --git a/_layouts/page.html b/_layouts/page.html
index 3c34381..93d5ab7 100644
--- a/_layouts/page.html
+++ b/_layouts/page.html
@@ -1,5 +1,5 @@
 <!doctype html>
-<html>
+<html lang="{{ site.lang | default: 'en-US' }}">
 <head>
   {% include meta.html %}
   <link rel="stylesheet" type="text/css" href="{{ "/assets/css/page.css" | relative_url }}"/>