diff --git a/layouts/contribution/list.html b/layouts/contribution/list.html
index d6668c1b8..1912d7b8e 100644
--- a/layouts/contribution/list.html
+++ b/layouts/contribution/list.html
@@ -116,7 +116,7 @@
     {{ with .Params.sectionCalendar }}
     <div>
         <div>
-            <iframe src="{{ .iframeUrl }}" style="border: 0" frameborder="0" scrolling="no"></iframe>
+            <iframe title="calendar" src="{{ .iframeUrl }}" style="border: 0" frameborder="0" scrolling="no"></iframe>
         </div>
     </div>
     {{ end }}