docs: added command to docker

jpfluger · jpfluger · commit 400110453209 · 2015-12-31T20:13:40.000+02:00
diff --git a/ubuntu-14.04/docker.md b/ubuntu-14.04/docker.md
@@ -203,6 +203,7 @@ Run 'docker COMMAND --help' for more information on a command.
 For system-wide information:
 
 ```bash
+$ sudo docker info
 Containers: 1
 Images: 2
 Server Version: 1.9.1
