diff --git a/README.md b/README.md
index b520951b..f77d1b47 100644
--- a/README.md
+++ b/README.md
@@ -119,6 +119,7 @@ Example `docker-compose.yml` for `mautic`:
         - mautic_data:/var/www/html
       environment:
         - MAUTIC_DB_HOST=127.0.0.1
+        - MYSQL_PORT_3306_TCP=3306
         - MAUTIC_DB_USER=root
         - MAUTIC_DB_PASSWORD=mysecret
         - MAUTIC_DB_NAME=mautic
@@ -130,6 +131,9 @@ Example `docker-compose.yml` for `mautic`:
 
 Run `docker-compose up`, wait for it to initialize completely, and visit `http://localhost:8080` or `http://host-ip:8080`.
 
+Run `docker inspect mautic_mauticdb_1 | grep IPAddress` to find out correct IP address of database container and setup the reference to mautic container in MAUTIC_DB_HOST environment variable.
+
+
 # Supported Docker versions
 
 This image is officially supported on Docker version 1.7.1.