diff --git a/README.md b/README.md
index 6b89261..068b15a 100644
--- a/README.md
+++ b/README.md
@@ -44,3 +44,12 @@ docker run -p 3000:3000/tcp -p 10000-10007:10000-10007/udp geckos-chat-app
 ```
 docker run --pull always -p 3000:3000/tcp -p 10000-10007:10000-10007/udp yandeu/geckos.io-simple-chat-app:latest
 ```
+
+## Multiple docker containers
+
+Run two docker containers with different ports.
+
+```bash
+docker run --pull always -d -p 3000:3000/tcp -p 10000:10000/udp -e PORT_RANGE_MIN=10000 -e PORT_RANGE_MAX=10000 yandeu/geckos.io-simple-chat-app:latest
+docker run --pull always -d -p 3001:3000/tcp -p 10001:10001/udp -e PORT_RANGE_MIN=10001 -e PORT_RANGE_MAX=10001 yandeu/geckos.io-simple-chat-app:latest
+```