Add example usage of AlternativeNames config option

README.md

@@ -135,7 +135,18 @@ encryption and authentication (via AEAD or similar techniques).**
 `ServerName` is the domain you want to make your ISP or firewall _think_ you are visiting. Ideally it should
 match `RedirAddr` in the server's configuration, a major site the censor allows, but it doesn't have to.
 
-`AlternativeNames` is an array used alongside `ServerName` to shuffle between different ServerNames for every new connection
+`AlternativeNames` is an array used alongside `ServerName` to shuffle between different ServerNames for every new
+connection. **This may conflict with `CDN` Transport mode** if the CDN provider prohibits domain fronting and rejects
+the alternative domains.
+
+Example:
+
+```json
+{
+  "ServerName": "bing.com",
+  "AlternativeNames": ["cloudflare.com", "github.com"]
+}
+```
 
 `CDNOriginHost` is the domain name of the _origin_ server (i.e. the server running Cloak) under `CDN` mode. This only
 has effect when `Transport` is set to `CDN`. If unset, it will default to the remote hostname supplied via the