diff --git a/README.md b/README.md
index 48e82ba..1e38171 100644
--- a/README.md
+++ b/README.md
@@ -100,7 +100,7 @@ logstash:
 
 As for the Java heap memory, another environment variable allows to specify JAVA_OPTS used by Logstash. You'll need to specify the appropriate options to enable JMX and map the JMX port on the docker host.
 
-Update the container in the `docker-compose.yml` to add the *LS_JAVA_OPTS* environment variable with the following content, do not forget to update the *-Djava.rmi.server.hostname* option with the IP address of your Docker host (replace **DOCKER_HOST_IP**):
+Update the container in the `docker-compose.yml` to add the *LS_JAVA_OPTS* environment variable with the following content (I've mapped the JMX service on the port 18080, you can change that), do not forget to update the *-Djava.rmi.server.hostname* option with the IP address of your Docker host (replace **DOCKER_HOST_IP**):
 
 ```yml
 logstash: