Index: modules/comment.rules.inc
===================================================================
--- modules/comment.rules.inc	(revision 6026b0eb7c5fdd24316bca8f5f5b154385d84491)
+++ modules/comment.rules.inc	(revision )
@@ -50,6 +50,12 @@
         'comment' => array('type' => 'comment', 'label' => t('deleted comment')),
       ),
     ),
+    'comment_approve' => $defaults + array(
+      'label' => t('After approving a new comment'),
+      'variables' => array(
+        'comment' => array('type' => 'comment', 'label' => t('approve comment')),
+      ),
+    ),
   );
 }
 
Index: modules/events.inc
===================================================================
--- modules/events.inc	(revision 6026b0eb7c5fdd24316bca8f5f5b154385d84491)
+++ modules/events.inc	(revision )
@@ -164,5 +164,12 @@
 }
 
 /**
+ * Implements of hook_comment_publish().
+ */
+function rules_comment_publish($comment) {
+  rules_invoke_event('comment_approve', $comment);
+}
+
+/**
  * @}
  */
\ No newline at end of file