diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/tools/additional-contents.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/tools/additional-contents.tt
index f03ee60b82..dd7b13ecab 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/tools/additional-contents.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/tools/additional-contents.tt
@@ -222,7 +222,7 @@
         [% END %]
     </div>
 
-    <form id="add_additional_content" method="post" action="/cgi-bin/koha/tools/additional-contents.pl" class="validate">
+    <form id="add_additional_content" method="post" action="/cgi-bin/koha/tools/additional-contents.pl" class="validated">
         [% INCLUDE 'csrf-token.inc' %]
         <input type="hidden" name="op" value="add_validate" />
         <input type="hidden" name="category" value="[% category | html %]" />
@@ -262,8 +262,9 @@
                     </li>
                 [% END %]
                 <li>
-                    <label for="from">Publication date: </label>
-                    <input id="from" type="text" name="published_on" size="15" value="[% additional_content.published_on | html %]" class="flatpickr" data-date_to="to" />
+                    <label for="from" class="required">Publication date: </label>
+                    <input id="from" type="text" name="published_on" size="15" value="[% additional_content.published_on | html %]" class="flatpickr" data-date_to="to" required="required" class="required" />
+                    <span class="required">Required</span>
                     <div class="hint">[% INCLUDE 'date-format.inc' %]</div>
                 </li>
                 <li>