* @param string $table The table that will be added to the content
* @param string $name The name of the row
* @param string $value The value of the row
- * @param string $id The ID to use for the 'tr' element
+ * @param string|null $id The ID to use for the 'tr' element
* @return string The table with the row added
*/
protected function addRow( $table, $name, $value, $id ) {