-* *@shell@* is the name of the VM that we want to connect to. This is sent to the switchyard server as if it were an SSH command, and the switchyard server connects to the VM on our behalf.
-* After the ProxyCommand section, we repeat @-x@ to disable X session forwarding to the virtual machine.
-* @-A@ specifies that we want to forward access to @ssh-agent@ to the VM.
+* @-x@ tells SSH not to forward your X session to the switchyard.
+* @-a@ tells SSH not to forward your ssh-agent credentials to the switchyard.
+* *@shell@* is the host name of the VM that we want to connect to. In summary, the string inside the quotation marks is sent to the switchyard server, as if it were an SSH command, and the switchyard server connects to the VM on our behalf.
+* After the @ProxyCommand@ section, we repeat @-x@ to disable X session forwarding to the virtual machine.