diff --git a/doc/VirtualMachine.md b/doc/VirtualMachine.md
index 323471fe..9a8cc29c 100644
--- a/doc/VirtualMachine.md
+++ b/doc/VirtualMachine.md
@@ -244,6 +244,9 @@ To start the PBot VM Host server, execute the `vm-server` script in the
 This will start a TCP server on port `9000`. It will listen for incoming commands and
 pass them along to the virtual machine's TCP serial port.
 
+The PBot instance is already preconfigured with commands that invoke the `applets/compiler_client.pl`
+script (a copy of `host/bin/vm-client`) to send VM commands to port `9000`.
+
 ### Test PBot
 All done. Everything is set up now. In your instance of PBot, the `sh echo hello` command should output `hello`.