diff --git a/index.html b/index.html
index 9ef6017f..c62c2864 100644
--- a/index.html
+++ b/index.html
@@ -10,6 +10,16 @@
 </head>
 <body style="padding:50px">
 
+<!-- Google Tag Manager -->
+<noscript><iframe src="//www.googletagmanager.com/ns.html?id=GTM-PQLCXB"
+height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
+<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
+new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
+j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
+'//www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
+})(window,document,'script','dataLayer','GTM-PQLCXB');</script>
+<!-- End Google Tag Manager -->
+
 <h1>Ultimate Hacking Keyboard &ndash; Agent mockups</h1>
 <ul class="nav nav-pills">
   <li role="presentation" class="active"><a href="index.html">Key action editor</a></li>
diff --git a/macro.html b/macro.html
index ab06be5b..df26d436 100644
--- a/macro.html
+++ b/macro.html
@@ -10,6 +10,16 @@
 </head>
 <body style="padding: 50px;">
 
+<!-- Google Tag Manager -->
+<noscript><iframe src="//www.googletagmanager.com/ns.html?id=GTM-PQLCXB"
+height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
+<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
+new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
+j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
+'//www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
+})(window,document,'script','dataLayer','GTM-PQLCXB');</script>
+<!-- End Google Tag Manager -->
+
 <h1>Ultimate Hacking Keyboard &mdash; Agent mockups</h1>
 <ul class="nav nav-pills">
   <li role="presentation"><a href="index.html">Key action editor</a></li>
