Merge pull request #11 from eiriksm/fix/doc-board-flag

Add more comments about the flag BOARD

diff --cc Makefile
index 5d60402670f0c5ac1dbcd8e829d1027e92fbd248,1e0ea8f6ebd8134cd612ab7b982bc0c56a4e214a..9bf7ed44e71bcaed90a21b018d76e86dfb26c0bc
--- 1/Makefile
--- 2/Makefile
+++ b/Makefile
@@@ -2,11 -2,14 +2,15 @@@
  GOSSAMER_PATH=gossamer
  
  # Which board are we building for?
+ # Options are:
+ # - sensorwatch_pro
+ # - sensorwatch_green
+ # - sensorwatch_red (also known as Sensor Watch Lite)
  BOARD=sensorwatch_pro
  
 -# Which screen are we building for?
 -DISPLAY=CLASSIC
 +# Sensor Watch will detect the display, unless you are debugging over USB.
 +# If you need to force a specific display, set this to the type you want, CLASSIC or CUSTOM
 +# FORCE_DISPLAY_TYPE=CUSTOM
  
  # Which sensor board?
  SENSOR=NONE