Index: filefield.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/filefield/filefield.module,v
retrieving revision 1.221
diff -u -p -r1.221 filefield.module
--- filefield.module	16 Jun 2010 23:25:16 -0000	1.221
+++ filefield.module	18 Jun 2010 20:05:12 -0000
@@ -359,6 +359,7 @@ function filefield_widget_upload_validat
     // Filefield only excuses uid 1 of quota requirements.
     'filefield_validate_extensions' => array($field['widget']['file_extensions']),
   );
+  $validators += module_invoke_all('filefield_validators', $field);
   return $validators;
 }