diff --git a/core/misc/autocomplete.js b/core/misc/autocomplete.js
index 5a1c156..5565229 100644
--- a/core/misc/autocomplete.js
+++ b/core/misc/autocomplete.js
@@ -184,6 +184,7 @@
       terms.push(ui.item.value);
     }
     event.target.value = terms.join(', ');
+    $(event.target).trigger('formUpdated');
     // Return false to tell jQuery UI that we've filled in the value already.
     return false;
   }