diff --git a/arduino.h b/arduino.h
index d80089b..476ba1b 100644
--- a/arduino.h
+++ b/arduino.h
@@ -32,8 +32,10 @@
 #define		READ(IO)					_READ(IO)
 #define		WRITE(IO, v)			_WRITE(IO, v)
 #define		TOGGLE(IO)				_TOGGLE(IO)
+
 #define		SET_INPUT(IO)			_SET_INPUT(IO)
 #define		SET_OUTPUT(IO)		_SET_OUTPUT(IO)
+
 #define		GET_INPUT(IO)			_GET_INPUT(IO)
 #define		GET_OUTPUT(IO)		_GET_OUTPUT(IO)
 
@@ -41,21 +43,19 @@
 	ports and functions
 
 	added as necessary or if I feel like it- not a comprehensive list!
-
-	probably needs some #ifdefs for various chip types
 */
 
 #if defined (__AVR_ATmega168__) || defined (__AVR_ATmega328__) || defined (__AVR_ATmega328P__)
 	#include	"arduino_168_328p.h"
-#endif	/*	_AVR_ATmega{168,328,328P}__) */
+#endif	/*	_AVR_ATmega{168,328,328P}__ */
 
 #if defined (__AVR_ATmega644__) || defined (__AVR_ATmega644P__) || defined (__AVR_ATmega644PA__)
 	#include	"arduino_644.h"
-#endif
+#endif	/*	_AVR_ATmega{644,644P,644PA}__ */
 
 #if defined (__AVR_ATmega1280__)
 	#include	"arduino_1280.h"
-#endif	/* __AVR_ATmega1280__) */
+#endif	/* __AVR_ATmega1280__ */
 
 #ifndef	DIO0_PIN
 #error pins for this chip not defined in arduino.h! If you write an appropriate pin definition and have this firmware work on your chip, please tell us via the forum thread
diff --git a/config.h.dist b/config.h.dist
index 4d63b40..e11ed24 100644
--- a/config.h.dist
+++ b/config.h.dist
@@ -20,6 +20,12 @@
 *                                                                           *
 \***************************************************************************/
 
+/*
+	Set your microcontroller type in Makefile! atmega168/atmega328p/atmega644p/atmega1280
+
+	If you want to port this to a new chip, start off with arduino.h and see how you go.
+*/
+
 /*
 	Are you using the official GEN3 motherboard with separate extruder controller?
 */