diff --git a/docs/content/advanced/override-defaults/postfix.md b/docs/content/advanced/override-defaults/postfix.md
index 763d32da..d8ed58eb 100644
--- a/docs/content/advanced/override-defaults/postfix.md
+++ b/docs/content/advanced/override-defaults/postfix.md
@@ -19,4 +19,6 @@ submission/inet/smtpd_reject_unlisted_recipient=no
 ```
 Run `postconf -P` in the container without arguments to see the active master options.
 
+Note! There should be no space between the parameter and the value.
+
 Have a look at the code for more information.
\ No newline at end of file