--- comment.module	2005-04-01 22:00:01.000000000 +0200
+++ comment.module	2005-04-04 13:57:05.000000000 +0200
@@ -440,6 +440,8 @@
   }
 
   // Validate the comment's body.
+  // Invoke other validation
+  module_invoke_all('comment', 'validate', $edit);
   if ($edit['comment'] == '') {
     form_set_error('comment', t('The body of your comment is empty.'));
   }
@@ -1417,6 +1419,9 @@
   // format selector
   $form .= filter_form('format', $edit['format']);
 
+  // Invoke other forms
+  $form .= implode('', module_invoke_all('comment', 'form', $edit));
+
   // preview button:
   $form .= form_hidden('cid', $edit['cid']);
   $form .= form_hidden('pid', $edit['pid']);