nfc.txt in rhodes-3.0.1.beta.6

- old
+ new
@@ -3,9 +3,11 @@
 ## NFC Overview
 NFC (Near Field Communication). NFC API provide access to NFC functionality. You can check NFC availability on current device and register callback for listen event when NFC tag near of device. Currently NFC supported only on Android. And also Android version must be 2.3.3 or later.
 NFC API implemented in native extension. You should add "nfc" to extension list in your nuild.yml before start using NFC in your application. And also do not forget enable NFC for start process NFC events - Rho::NFCManager.enable.
 NFC Ruby API based on Android NFC API. We recommended investigate Android doc for understand NFC Techs etc. See [Android NFC](http://developer.android.com/guide/topics/nfc/index.html)
 
+NOTE: Before start using of NFC functionality, do not forget check current platform for supporting of NFC ! Use this :   Rho::NFCManager.is_supported
+
 ## NFC events
 There are two different NFC callback can be received (you should setup callbacks before!) :
 * NFC callback : it executed when Android ACTION_NDEF_DISCOVERED or ACTION_TAG_DISCOVERED events processed.
 * NFC Tech callback : it executed when Android ACTION_TECH_DISCOVERED event processed.
 In case of current state of NFC support in Android you can receive NFC callback only if your application in foreground. If your application is not run or in background - only ACTION_TECH_DISCOVERED is processed. 