diff --git a/README.md b/README.md
index d6d68c49..660adb1b 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ wishthis is a simple, intuitive and modern wishlist platform to create, manage a
 -   Apache or Nginx
 -   PHP 8.1
     -   [intl](https://www.php.net/manual/en/book.intl.php)
--   [MJML](https://mjml.io/api) api keys
+-   [MJML](https://mjml.io/api) api keys (not required and used for rendering emails. Make sure [sendmail](https://www.php.net/manual/en/mail.configuration.php) is configured properly.)
 
 ## :hammer: Installation