--- a/ckanext/ga_report/templates/ga_report/publisher/index.html
+++ b/ckanext/ga_report/templates/ga_report/publisher/index.html
@@ -8,6 +8,7 @@
   <py:match path="primarysidebar">
     <li class="widget-container boxed widget_text">
       <h4>Publishers</h4>
+      <p>The table shows the top 20 publishers as recorded by page views of datasets owned by that publisher, and the number of visits to each publisher's home page.</p>
     </li>
   </py:match>