Update understanding-docker.md (docker#406)

Misty Stanley-Jones · web-flow · commit 089d9100fdad · 2016-11-15T16:06:04.000-08:00
* Update understanding-docker.md

* Update understanding-docker.md
diff --git a/engine/understanding-docker.md b/engine/understanding-docker.md
@@ -94,8 +94,8 @@ Docker uses a client-server architecture. The Docker *client* talks to the
 Docker *daemon*, which does the heavy lifting of building, running, and
 distributing your Docker containers. The Docker client and daemon *can*
 run on the same system, or you can connect a Docker client to a remote Docker
-daemon. The Docker client and daemon communicate via sockets or through a
-REST API.
+daemon. The Docker client and daemon communicate using a REST API, over UNIX
+sockets or a network interface.
 
 ![Docker Architecture Diagram](article-img/architecture.svg)
 
