function photosets_comments_addComment($photoset_id, $comment_text) {
        /** http://www.flickr.com/services/api/flickr.photosets.comments.addComment.html */
        $this->request("flickr.photosets.comments.addComment", array("photoset_id" => $photoset_id, "comment_text"=>$comment_text), TRUE);
        return $this->parsed_response ? $this->parsed_response['comment'] : false;
    }