readme: add in vtuner fallback domain name notes

README.md

@@ -50,8 +50,8 @@ itself gets handled by the AVR directly, i.e. you can run it on a low-spec RISC
 1) Create your initial `stations.yml` and put it in the same directory as `ycast.py`. The config follows a basic YAML structure (see below).
 2) Create a manual entry in your DNS server (read 'Router' for most home users) pointing to the IP/Hostname of the machine YCast is running on for each vendor you want to use:
 
-  * Yamaha AVRs: `radioyamaha.vtuner.com`
-  * Onkyo AVRs: `onkyo.vtuner.com`
+  * Yamaha AVRs: `radioyamaha.vtuner.com` (and optionally `radioyamaha2.vtuner.com`)
+  * Onkyo AVRs: `onkyo.vtuner.com` (and optionally `onkyo2.vtuner.com`)
 
 3) Run `ycast.py`.