--- comment.module	2006-05-03 14:42:50.000000000 +0200
+++ comment.module	2006-05-03 14:56:23.000000000 +0200
@@ -428,6 +428,7 @@ function comment_reply($nid, $pid = NULL
 
 function comment_validate_form($edit) {
   global $user;
+  module_invoke_all('comment', 'validate', $edit);
 
   // Validate the comment's subject.  If not specified, extract
   // one from the comment's body.
@@ -1411,6 +1412,8 @@ function theme_comment_form($edit, $titl
   // format selector
   $form .= filter_form('format', $edit['format']);
 
+  $form .= implode('', module_invoke_all('comment', 'form', $edit));
+
   // preview button:
   $form .= form_hidden('cid', $edit['cid']);
   $form .= form_hidden('pid', $edit['pid']);