diff --git a/stopwatch.html b/stopwatch.html
index ac835da..41b284e 100644
--- a/stopwatch.html
+++ b/stopwatch.html
@@ -10,6 +10,13 @@
       gtag('config', 'G-SLCHF8P25K');
     </script>
     <script type="text/javascript" data-cmp-ab="1" src="https://cdn.consentmanager.net/delivery/autoblocking/31566d9c7185e.js" data-cmp-host="a.delivery.consentmanager.net" data-cmp-cdn="cdn.consentmanager.net" data-cmp-codesrc="16"></script>
+    <!-- Google Tag Manager -->
+<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=
+'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
+})(window,document,'script','dataLayer','GTM-NJ2KPZTP');</script>
+<!-- End Google Tag Manager -->
     <meta charset='utf-8'>
     <meta name='viewport' content='user-scalable=no,width=device-width,initial-scale=1'>
     <title>stopwatch</title>
@@ -236,6 +243,10 @@
     </script>
 </head>
 <body>
+    <!-- Google Tag Manager (noscript) -->
+<noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-NJ2KPZTP"
+height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
+<!-- End Google Tag Manager (noscript) -->
     <div id='main'>
         <div id='display'></div>
 	    <h1>Stop Watch</h1>       
