diff --git a/keywords.txt b/keywords.txt
index f9c13cb..5b3b4ea 100644
--- a/keywords.txt
+++ b/keywords.txt
@@ -28,7 +28,7 @@ LEDS	KEYWORD2
 updateLEDS	KEYWORD2
 numLock	KEYWORD2
 capsLock	KEYWORD2
-scrollLock
+scrollLock	KEYWORD2
 
 # MIDIDevice
 getType	KEYWORD2
@@ -79,3 +79,10 @@ getWheelH	KEYWORD2
 joystickDataClear	KEYWORD2
 getAxis	KEYWORD2
 
+# USBSerial
+USBHOST_SERIAL_7E1	LITERAL1
+USBHOST_SERIAL_7O1	LITERAL1
+USBHOST_SERIAL_8N1	LITERAL1
+USBHOST_SERIAL_8N2	LITERAL1
+USBHOST_SERIAL_8E1	LITERAL1
+USBHOST_SERIAL_8O1	LITERAL1
\ No newline at end of file