diff --git a/README.md b/README.md
index c6d9901..714f463 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,6 @@ Edit /etc/default/minifirewall file:
 To use minifirewall with Docker you need to change the variable `DOCKER='on'`
 Then, authorisation for public/semi-public/private ports will also work for dockerized services
 
-
 **WARNING** : When the port mapping on the host is different than in the container (ie: listen on :8090 on the host, but the service in the container listen on :8080)
 you need to use the port used by the container (ie: 8080) in the public/semi-public/private port list
 
diff --git a/minifirewall.conf b/minifirewall.conf
index 83c7af3..e16c8fb 100644
--- a/minifirewall.conf
+++ b/minifirewall.conf
@@ -17,6 +17,9 @@ IPV6='on'
 # (ie: Listen on :8090 on host, but :8080 in container)
 # then you need to give the port used inside the container
 DOCKER='off'
+# WARNING : If the port mapping is different between host and container
+# (ie: Listen on :8090 on host but :8080 in container)
+# Then you need to makes the rules with the port used inside the container
 
 # Trusted local network
 # ...will be often IPv4/32 or IPv6/128 if you don't trust anything