diff --git a/MFRC522.h b/MFRC522.h
index 110603b..72f8411 100644
--- a/MFRC522.h
+++ b/MFRC522.h
@@ -372,7 +372,7 @@ public:
 	MFRC522::StatusCode MIFARE_Transfer(byte blockAddr);
 	MFRC522::StatusCode MIFARE_GetValue(byte blockAddr, long *value);
 	MFRC522::StatusCode MIFARE_SetValue(byte blockAddr, long value);
-	MFRC522::StatusCode PCD_NTAG216_AUTH(byte *passWord);
+	MFRC522::StatusCode PCD_NTAG216_AUTH(byte *passWord, byte pACK[]);
 
 	
 	/////////////////////////////////////////////////////////////////////////////////////