diff --git a/index.html b/index.html
index 88415d33a..63067a99c 100644
--- a/index.html
+++ b/index.html
@@ -14,6 +14,7 @@
   <!--[if IE 7]> <style type="text/css"> body { behavior: url(/style-v2/csshover3.htc); } </style> <![endif]-->
   <meta name="google-site-verification" content=
   "mpr2HgFpodnbF_8fv4qXd9roIClVwtX3C-Kd3F6r61w" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
 </head><!--
 Note: Editing website content is documented at:
 https://www.boost.org/development/website_updating.html