diff --git a/README.md b/README.md
index b2bb05eb..161f6ecf 100644
--- a/README.md
+++ b/README.md
@@ -111,6 +111,9 @@ may have unexpected consequences if applied to other TIMDEX UI apps.
 - `FILTER_SUBJECT`: The name to use instead of "Subject" for that filter / aggregation.
 - `GLOBAL_ALERT`: The main functionality for this comes from our theme gem, but when set the value will be rendered as
   safe html above the main header of the site.
+- `MATOMO_CONTAINER_URL`: This is one of two options for integrating a TIMDEX UI application with Matomo - the Tag Manager. This is the only parameter needed for using a tag manager container.
+- `MATOMO_SITE_ID`: Integrating with Matomo using the legacy approach (instead of Tag Manager) requires two values: the site id and a URL. This is one of those legacy values.
+- `MATOMO_URL`: Integrating with Matomo using the legacy approach (instead of Tag Manager) requires two values: the site id and a URL. This is one of those legacy values.
 - `ORIGINS`: sets origins for CORS (currently used only for TACOS API calls).
 - `PLATFORM_NAME`: The value set is added to the header after the MIT Libraries logo. The logic and CSS for this comes from our theme gem.
 - `PRIMO_TIMEOUT`: The number of seconds before a Primo request times out (default 6).
diff --git a/app/views/layouts/_head.html.erb b/app/views/layouts/_head.html.erb
index 9fe5230b..136b84ff 100644
--- a/app/views/layouts/_head.html.erb
+++ b/app/views/layouts/_head.html.erb
@@ -26,7 +26,18 @@
 
 <%= yield :additional_js %>
 
-<% if (ENV['MATOMO_URL'].present? && ENV['MATOMO_SITE_ID'].present?) %>
+<% if (ENV['MATOMO_CONTAINER_URL'].present?) %>
+<!-- Matomo Tag Manager -->
+<script type="text/javascript">
+  var _mtm = window._mtm = window._mtm || [];
+  _mtm.push({'mtm.startTime': (new Date().getTime()), 'event': 'mtm.Start'});
+  (function() {
+    var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
+    g.async=true; g.src='<%= ENV['MATOMO_CONTAINER_URL'] %>'; s.parentNode.insertBefore(g,s);
+  })();
+</script>
+<!-- End Matomo Tag Manager -->
+<% elsif (ENV['MATOMO_URL'].present? && ENV['MATOMO_SITE_ID'].present?) %>
 <!-- Matomo -->
 <script type="text/javascript">
   var _paq = window._paq || [];