updated readme..

README

@@ -7,5 +7,11 @@ the pre-existing raspberry-pi-phonehome listener daemon to be a
 command-listener.  The command is a variable inside the script
 of course.  Note that the command-listener logs to /tmp/command-listener.log
 
-In addition, I wrote a very simple cat-client that connects to
-a server (like telnet) and grabs the output..
+The command-listener needs to take one line of input - additional command
+line arguments for the command to be run, similarly the command-client
+needs to pass that line..
+
+In addition, there's a very simple cat-client that connects to
+a server (like telnet) and grabs the output..  NOTE THAT IT CAN'T
+BE USED TO CONNECT TO COMMAND-LISTENER, because cat-client doesn't
+pass the line of extra arguments down the wire.