diff --git a/core/modules/system/lib/Drupal/system/Controller/TimezoneController.php b/core/modules/system/lib/Drupal/system/Controller/TimezoneController.php
index e1c16e2..e9835d8 100644
--- a/core/modules/system/lib/Drupal/system/Controller/TimezoneController.php
+++ b/core/modules/system/lib/Drupal/system/Controller/TimezoneController.php
@@ -15,21 +15,22 @@
 class TimezoneController {
 
   /**
-   * Retrieve a JSON object containing a time zone name given a timezone abbreviation.
+   * Retrieve a JSON object containing a time zone name given a timezone
+   * abbreviation.
    *
    * @param string $abbreviation
    *   Time zone abbreviation.
-   * @param $offset
+   * @param int $offset
    *   Offset from GMT in seconds. Defaults to -1 which means that first found
-   *   time zone corresponding to abbr is returned.
-   *   Otherwise exact offset is searched and only if not found then the first
-   *   time zone with any offset is returned.
+   *   time zone corresponding to abbr is returned. Otherwise exact offset is
+   *   searched and only if not found then the first time zone with any offset
+   *   is returned.
    * @param null|bool $is_daylight_saving_time
-   *   Daylight saving time indicator. If abbr does not
-   *   exist then the time zone is searched solely by
-   *   offset and isdst.
+   *   Daylight saving time indicator. If abbr does not exist then the time
+   *   zone is searched solely by offset and isdst.
    *
    * @return JsonResponse
+   *   The timezone name in JsonResponse object.
    */
   public function getTimezone($abbreviation = '', $offset = -1, $is_daylight_saving_time = NULL) {
     // An abbreviation of "0" passed in the callback arguments should be