Better explanation of different parts

roles/provision/README.md

@@ -2,7 +2,7 @@ provision
 =========
 
 Does first five minutes security, sets up user account, installs packages and sets up dotfiles.
-Each part of that can be done separately by specifying the appropriate tag.
+Each part of that can be done separately by specifying the appropriate tag, out of `system`, `account`, `ssh` and `dotfiles`.
 
 Variables
 ------------
@@ -11,12 +11,12 @@ Variables
 
 `provision_is_vm` may be defined as true to install qemu guest agent.
 
-`provision_is_desktop` may be defined to configure WSL and ignore server-side dependencies
+`provision_is_desktop` may be defined
+- If `true`, install complete dev environment for NVim. Also install WSL config
+- If `false`, configure SSHd
 
 `provision_copy_private_key` may be defined to copy the SSH private key as well as authorising the public key.
 
 Requirements
 ------------
 
-System, account and SSH setup must be run with `become`, dotfiles can be run without.
-