diff --git a/tech/Docker.wiki b/tech/Docker.wiki
index 12e32b3..6c4d5b2 100644
--- a/tech/Docker.wiki
+++ b/tech/Docker.wiki
@@ -14,7 +14,22 @@ the `docker` command is all thats needed to run a container.
 == docker-compose ==
 
 Docker-compose allows you to automate setting up several containers into a
-single command.
+single command. 
+
+=== ports ===
+
+* expose a port in the container to the world
+* below binds port 8080 of the container to reply to any IP on the host at port
+  80
+
+{{{
+ports:
+  - 0.0.0.0:80:8080/tcp
+  }}}
+
+=== volumes ===
+
+* mount a folder on the filesystem inside the container
 
 == Useful commands ==