diff --git a/README.md b/README.md
index 4dc1a37..8c7076b 100644
--- a/README.md
+++ b/README.md
@@ -253,7 +253,7 @@ Returns a pointer to the payload.
 
 ##### `VitoWiFi<PROTOCOL_VERSION>(IFACE* interface)`
 
-Constructor of the VitoWiFi class. `PROTOCOL_VERSION` can be `VS1` or `VS2`. If your Viessmann device is somewhat modern, you should use `VS2`.
+Constructor of the VitoWiFi class. `PROTOCOL_VERSION` can be  `GWG`, `VS1` or `VS2`. If your Viessmann device is somewhat modern, you should use `VS2`.
 `interface` can be any of the `HardwareSerial` interfaces (`Serial`, `Serial1`...), `SoftwareSerial` or if you are on Linux, pass the c-string depicting your device (for example `"/dev/ttyUSB0"`).
 
 ##### `void onResponse(typename PROTOCOLVERSION::OnResponseCallback callback)`
diff --git a/keywords.txt b/keywords.txt
index 2a4c156..852f3d0 100644
--- a/keywords.txt
+++ b/keywords.txt
@@ -27,7 +27,6 @@ encode	KEYWORD2
 
 #PacketVS2 public methods
 createPacket	KEYWORD2
-#setLength	KEYWORD2
 length	KEYWORD2
 packetType	KEYWORD2
 functionCode	KEYWORD2
@@ -42,8 +41,20 @@ checksum	KEYWORD2
 # Constants (LITERAL1)
 #######################################
 
+#Protocols
+GWG	LITERAL1
+VS1	LITERAL1
+VS2	LITERAL1
+
+#Enums
+TIMEOUT	LITERAL1
+LENGTH	LITERAL1
+NACK	LITERAL1
+CRC	LITERAL1
+ERROR	LITERAL1
+
 #Transformation
+div2	LITERAL2
 div10	LITERAL2
 div3600	LITERAL2
 noconv	LITERAL2
-raw	LITERAL2