actually say what variable to set mmkay

README.md

@@ -6,6 +6,6 @@ A very simple script that executes ~/.config/rc.local for your users.
     > ./userrc -h
     Usage: userrc [-c config] [-l logdir]
 
-The script has two access modes: blacklist (default) and explicit.
+The script has two access modes: blacklist (default) and explicit. It is set via the `access_mode` variable in the config.  
 In blacklist mode, it will find and execute rc.local for every user in the system except for the ones in the `users_deny` array.  
 In expicit mode, it will find and execute rc.local for every user in the `users_allow` array.