diff --git a/_layouts/default.html b/_layouts/default.html
index 7e0c0a0..6a6fd75 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -27,6 +27,9 @@
         <link href="http://plus.google.com/+SimonHolywell" rel="author">
 
         <link rel="canonical" href="{{ site.url }}">
+        <link rel="alternate" hreflang="x-default" href="{{ site.url }}">
+        <link rel="alternate" hreflang="ja" href="{{ site.url }}/ja/">
+        <link rel="alternate" hreflang="zh" href="{{ site.url }}/zh/">
     </head>
     <body itemscope itemtype="http://schema.org/TechArticle">
         <meta itemprop="wordCount" content="{{ content | number_of_words }}">
