Index: formfilter.module
===================================================================
--- formfilter.module	(revision 41)
+++ formfilter.module	(working copy)
@@ -5,7 +5,7 @@
  * Array of form element types for which filtering is supported.
  */
 function formfilter_supported_types() {
-  return array('button', 'fieldset', 'select', 'textfield', 'checkbox', 'checkboxes', 'radio', 'radios', 'textarea', 'item', 'file', 'weight', 'markup');
+  return array('button', 'fieldset', 'select', 'textfield', 'checkbox', 'checkboxes', 'radio', 'radios', 'textarea', 'item', 'file', 'weight', 'markup', 'submit');
 }