There are common actions for Comment Edit Lite.
Don't want to mess with code? Comment Edit Pro provides a user interface for the commonly-requested features.
Useful for custom comment fields
* Action: sce_save_after
* Allow third parties to save content after a comment has been updated
* @since 1.4.0
* @param object $comment_to_save The Comment Object
* @param int $post_id The Post ID
* @param int $comment_id The Comment ID