diff --git a/docs/utils/mail.md b/docs/utils/mail.md
index dcbad18..a4d8bbe 100644
--- a/docs/utils/mail.md
+++ b/docs/utils/mail.md
@@ -33,7 +33,10 @@ public function foo(MailNotifier $notifier, UserRepositoryQuery $query)
         ->init()
         ->setSubject('Your bill')
         ->addRecipient('john.doe@example.com')
-        ->addRecipients($query->create()->where('.isAdmin = true')->find(), true)
+        ->addRecipients(array_map(
+            fn($u) => $u->getEmail(),
+            $query->create()->where('.isAdmin = true')->find()
+        ), true)
         ->addAttachment('path/to/bill.pdf')
         ->notify('mail/bill.html.twig', [
             // view params