add on

README.md

@@ -95,10 +95,17 @@ https://cli.vuejs.org/guide/creating-a-project.html#vue-create
 ```
 
 ```bash
+
+docker exec -it -udocker -p [host-port]:[expose-port*]  hybrid-nodevuejs_master_1 /bin/bash
+e.g.
 docker exec -it -udocker -p 8080:8080  hybrid-nodevuejs_master_1 /bin/bash
                           ^^^^^^^^^^^
 ```
 
+* this is the port found in the container menu.
+
+__We would expect the port number do be next to the "Ports" field.__
+
 :warning: Publishing Docker ports via -p
 
 Using the -p (lower case) flag at runtime lets you publish a container’s specific port(s) to the Docker host.