diff --git a/templates/theme.html b/templates/theme.html
index bb961b8..86940a9 100644
--- a/templates/theme.html
+++ b/templates/theme.html
@@ -292,7 +292,7 @@ if (!consentCookie) {//L'utilisateur n'a pas encore de cookie de consentement
 }
 </script>
 
-<!-- Piwik -->
+<!-- Piwik and Google Tag Manager -->
 <script type="text/javascript">
 if (consentCookie) {
   var _paq = _paq || [];
@@ -305,9 +305,12 @@ if (consentCookie) {
     var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
     g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'piwik.js'; s.parentNode.insertBefore(g,s);
   })();
+
+  (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-5VBK28');
+
 }
 </script>
-<!-- End Piwik Code -->
+<!-- End Piwik and Google Tag Manager Code -->
 
 </body>