diff --git a/keywords.txt b/keywords.txt
index 0970a21a..5feb6969 100644
--- a/keywords.txt
+++ b/keywords.txt
@@ -117,8 +117,8 @@ clearGdo2Action	KEYWORD2
 setTCXO	KEYWORD2
 setDio2AsRfSwitch	KEYWORD2
 getTimeOnAir	KEYWORD2
-implicitHeader
-explicitHeader
+implicitHeader	KEYWORD2
+explicitHeader	KEYWORD2
 setSyncBits	KEYWORD2
 setWhitening	KEYWORD2
 startReceiveDutyCycle	KEYWORD2