diff --git a/_layouts/default.html b/_layouts/default.html
index 6a6fd75..d5f9e33 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -28,6 +28,7 @@
 
         <link rel="canonical" href="{{ site.url }}">
         <link rel="alternate" hreflang="x-default" href="{{ site.url }}">
+        <link rel="alternate" hreflang="en" href="{{ site.url }}">
         <link rel="alternate" hreflang="ja" href="{{ site.url }}/ja/">
         <link rel="alternate" hreflang="zh" href="{{ site.url }}/zh/">
     </head>