diff --git a/_themes/sphinx_rtd_theme/layout.html b/_themes/sphinx_rtd_theme/layout.html
index 44978c96..511a0954 100644
--- a/_themes/sphinx_rtd_theme/layout.html
+++ b/_themes/sphinx_rtd_theme/layout.html
@@ -77,6 +77,16 @@
   {# Keep modernizr in head - http://modernizr.com/docs/#installing #}
   <script src="{{ pathto('_static/js/modernizr.min.js', 1) }}"></script>
 
+<!-- Google tag (gtag.js) -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=G-MSW8E7B3LE"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+
+  gtag('config', 'G-MSW8E7B3LE');
+</script>
+
 </head>
 
 <body class="wy-body-for-nav" role="document">
