diff --git a/templates/main.html b/templates/main.html
index c0ab7284..8dd475a2 100644
--- a/templates/main.html
+++ b/templates/main.html
@@ -3,6 +3,7 @@
 <head>
     <meta name="fragment" content="!">
     <meta name="google-site-verification" content="8BxOTw-Q02DS2KAdcGcnIMwiPZ58DVB18XpOfRibCcg">
+    <meta name="msvalidate.01" content="E878301FE3E3F12D233A6B1156889601" />
     <meta name="viewport" content="width=device-width, maximum-scale=1.0" />
 
     <base href="/">