README: clarify what Docker Compose ports are for

README.md

@@ -24,11 +24,14 @@ Configuration for Docker Compose
 Configuration of the `/deployment` Docker Compose setup consists of
 three port numbers.
 
-* `ULOCOMPOSE_DBPORT` is the port the GraphDB instance listens on.
+* `ULOCOMPOSE_DBPORT` is the port the GraphDB instance is exposed
+  to.
 
-* `ULOCOMPOSE_COLLECTPORT` is the port the collector listens on.
+* `ULOCOMPOSE_COLLECTPORT` is the port the collector is exposed to.
 
-* `ULOCOMPOSE_APPPORT` is the port the application listens on.
+* `ULOCOMPOSE_APPPORT` is the port the application is exposed to.
+
+There is no authentication. You will have to add some yourself.
 
 Configuration for Local Installs
 --------------------------------
@@ -40,7 +43,7 @@ environment variables
 * `ULOAPPS_LISTEN_HOST` for the host, e.g. `localhost` or some IP
   address.
 
-* `ULOAPPS_LISTEN_PORT` for the port number, e.g. 7200 or 1234.
+* `ULOAPPS_LISTEN_PORT` for the port number, e.g. 7400 or 1234.
 
 `ulo-storage-applications` needs a reachable GraphDB instance to
 connect to. Configure that instance with the following two environment