public function column_default( $comment, $column_name ) {
		/**
		 * Fires when the default column output is displayed for a single row.
		 *
		 * @since 2.8.0
		 *
		 * @param string $column_name         The custom column's name.
		 * @param int    $comment->comment_ID The custom column's unique ID number.
		 */
		do_action( 'manage_comments_custom_column', $column_name, $comment->comment_ID );
	}