diff --git a/src/PhoneNumberToTimeZonesMapper.php b/src/PhoneNumberToTimeZonesMapper.php
index 9f5da839d..13f8bb1fc 100644
--- a/src/PhoneNumberToTimeZonesMapper.php
+++ b/src/PhoneNumberToTimeZonesMapper.php
@@ -81,7 +81,7 @@ public static function getUnknownTimeZone()
      * the validity of the number passed in.
      *
      * @param $number PhoneNumber the phone number for which we want to get the time zones to which it belongs
-     * @return array a list of the corresponding time zones or a single element list with the default
+     * @return string[] a list of the corresponding time zones or a single element list with the default
      *     unknown time zone if no other time zone was found or if the number was invalid
      */
     public function getTimeZonesForNumber(PhoneNumber $number)
@@ -103,7 +103,7 @@ public function getTimeZonesForNumber(PhoneNumber $number)
      * Returns the list of time zones corresponding to the country calling code of {@code number}.
      *
      * @param $number PhoneNumber the phone number to look up
-     * @return array the list of corresponding time zones or a single element list with the default
+     * @return string[] the list of corresponding time zones or a single element list with the default
      *     unknown time zone if no other time zone was found
      */
     protected function getCountryLevelTimeZonesforNumber(PhoneNumber $number)
@@ -120,7 +120,7 @@ protected function getCountryLevelTimeZonesforNumber(PhoneNumber $number)
      * for geo-localization.
      *
      * @param $number PhoneNumber a valid phone number for which we want to get the time zones to which it belongs
-     * @return array a list of the corresponding time zones or a single element list with the default
+     * @return string[] a list of the corresponding time zones or a single element list with the default
      *     unknown time zone if no other time zone was found or if the number was invalid
      */
     public function getTimeZonesForGeographicalNumber(PhoneNumber $number)
@@ -132,7 +132,7 @@ public function getTimeZonesForGeographicalNumber(PhoneNumber $number)
      * Returns a list of time zones to which a geocodable phone number belongs.
      *
      * @param PhoneNumber $number The phone number for which we want to get the time zones to which it belongs
-     * @return array the list of correspondiing time zones or a single element list with the default
+     * @return string[] the list of corresponding time zones or a single element list with the default
      * unknown timezone if no other time zone was found or if the number was invalid
      */
     protected function getTimeZonesForGeocodableNumber(PhoneNumber $number)
diff --git a/src/prefixmapper/PrefixTimeZonesMap.php b/src/prefixmapper/PrefixTimeZonesMap.php
index f7338d4f2..3ec6c8a28 100644
--- a/src/prefixmapper/PrefixTimeZonesMap.php
+++ b/src/prefixmapper/PrefixTimeZonesMap.php
@@ -25,7 +25,7 @@ public function __construct($map)
      * instead of a long.
      *
      * @param $number PhoneNumber the phone number to look up
-     * @return array the list of corresponding time zones
+     * @return string[] the list of corresponding time zones
      */
     public function lookupTimeZonesForNumber(PhoneNumber $number)
     {
@@ -45,7 +45,7 @@ public function lookupTimeZonesForNumber(PhoneNumber $number)
      * input. Also, any of its prefixes, such as 16502, is also valid.
      *
      * @param $key int the key to look up
-     * @return array the list of corresponding time zones
+     * @return string[] the list of corresponding time zones
      */
     protected function lookupTimeZonesForNumberKey($key)
     {
@@ -64,7 +64,7 @@ protected function lookupTimeZonesForNumberKey($key)
      * Split {@code timezonesString} into all the time zones that are part of it.
      *
      * @param $timezonesString String
-     * @return array
+     * @return string[]
      */
     protected function tokenizeRawOutputString($timezonesString)
     {
@@ -75,7 +75,7 @@ protected function tokenizeRawOutputString($timezonesString)
      * Returns the list of time zones {@code number}'s calling country code corresponds to.
      *
      * @param $number PhoneNumber the phone number to look up
-     * @return array the list of corresponding time zones
+     * @return string[] the list of corresponding time zones
      */
     public function lookupCountryLevelTimeZonesForNumber(PhoneNumber $number)
     {