diff --git a/README.md b/README.md
index 579312e..199231f 100644
--- a/README.md
+++ b/README.md
@@ -40,6 +40,6 @@ Following Files are important and have been changed and setup with the script:
 To add additional custom environment variables, you can add a file .env.custom and add your variables there.
 This file will not be changed from the setup script and will be used inside all containers to overwrite the existing .env and .env.local
 ```sh
-MAILER_DSN='smtp://null'
+MAILER_DSN='smtps://<username>:<password>@<smtpHost>:<smtpPort>'
 DEFAULT_LANGUAGE='de'
-```
\ No newline at end of file
+```