diff --git a/src/Config/NotificationMailConfig.php b/src/Config/NotificationMailConfig.php
index 87ffca16..8f9bce7c 100644
--- a/src/Config/NotificationMailConfig.php
+++ b/src/Config/NotificationMailConfig.php
@@ -7,6 +7,7 @@
 
 class NotificationMailConfig extends Data
 {
+    /** @param string|array<string> $to */
     protected function __construct(
         public string|array $to,
         public NotificationMailSenderConfig $from,
diff --git a/tests/Notifications/EventHandlerTest.php b/tests/Notifications/EventHandlerTest.php
index d482cfe0..6fe3a0a2 100644
--- a/tests/Notifications/EventHandlerTest.php
+++ b/tests/Notifications/EventHandlerTest.php
@@ -63,7 +63,7 @@
 
     $config = NotificationMailConfig::fromArray($data);
 
-    expect($config->to)->toBe(['single@example.com']);
+    expect($config->to)->toBe('single@example.com');
 });
 
 it('will accept multiple email addresses', function () {