README.md in wialon_api-0.0.5 vs README.md in wialon_api-0.0.6

- old
+ new
@@ -141,11 +141,16 @@
   # log response JSON after successful responses
   # config.log_responses = false
 
   # Wialon server host
   # config.wialon_host = 'https://hst-api.wialon.com/wialon/ajax.html'
+
+  # Wialon server edition: :hosting, :local, :pro
+  # config.wialon_edition = :hosting
 end
 ```
+
+Note that `Wialon Pro` edition uses different parameters in requests, e.g. `ssid` vs `eid` as the session identifier. `WialonApi` gem handles these differences automatically.
 
 `Net::HTTP` is used by default for a HTTP requests. One can choose any [other adapter](https://github.com/technoweenie/faraday/blob/master/lib/faraday/adapter.rb) suported by `faraday`.
 
 Options for faraday connection (e.g. proxy settings or SSL certificates path) could be set through `faraday_options` when configuring `wialon_api`
 