diff --git a/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesApiTransport.php b/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesApiTransport.php
index 0bd5627ac9..615a4f7d49 100644
--- a/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesApiTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesApiTransport.php
@@ -33,7 +33,7 @@ class SesApiTransport extends AbstractApiTransport
     private $region;
 
     /**
-     * @param string $region Amazon SES region (currently one of us-east-1, us-west-2, or eu-west-1)
+     * @param string|null $region Amazon SES region (currently one of us-east-1, us-west-2, or eu-west-1)
      */
     public function __construct(string $accessKey, string $secretKey, string $region = null, HttpClientInterface $client = null, EventDispatcherInterface $dispatcher = null, LoggerInterface $logger = null)
     {
diff --git a/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesHttpTransport.php b/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesHttpTransport.php
index a6a6ea0190..db889ecbde 100644
--- a/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesHttpTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesHttpTransport.php
@@ -31,7 +31,7 @@ class SesHttpTransport extends AbstractHttpTransport
     private $region;
 
     /**
-     * @param string $region Amazon SES region (currently one of us-east-1, us-west-2, or eu-west-1)
+     * @param string|null $region Amazon SES region (currently one of us-east-1, us-west-2, or eu-west-1)
      */
     public function __construct(string $accessKey, string $secretKey, string $region = null, HttpClientInterface $client = null, EventDispatcherInterface $dispatcher = null, LoggerInterface $logger = null)
     {
diff --git a/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesSmtpTransport.php b/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesSmtpTransport.php
index d0ced89acd..b9567b5e27 100644
--- a/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesSmtpTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesSmtpTransport.php
@@ -21,7 +21,7 @@ use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 class SesSmtpTransport extends EsmtpTransport
 {
     /**
-     * @param string $region Amazon SES region (currently one of us-east-1, us-west-2, or eu-west-1)
+     * @param string|null $region Amazon SES region (currently one of us-east-1, us-west-2, or eu-west-1)
      */
     public function __construct(string $username, string $password, string $region = null, EventDispatcherInterface $dispatcher = null, LoggerInterface $logger = null)
     {