documented configuration options...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>

thinkpad-keyboard-brightness.conf

@@ -1,11 +1,33 @@
+
+# Light sensor path
 #
+# NOTE: for devices with multiple sensors this will select the first
+# 	one, if a specific sensor's output is to be use set this to an 
+# 	explicit path to that sensor
+# NOTE: the device nubering may change on hardware change.
 #SENSOR=/sys/bus/iio/devices/iio:device*/in_illuminance_raw
+
+# Keyboard backlight LED path
 #
-# TRIGGER=/sys/class/leds/tpacpi::kbd_backlight/brightness
+# NOTE: if your device has multiple keyboards connected this will select 
+# 	the first one, if this is not desired set this to a specific 
+# 	value for the device to be controlled.
+#TRIGGER=/sys/class/leds/*::kbd_backlight/brightness
+
+# Sensor threshold at which the backlight is switched on
 #
 #THRESHOLD=2000
+
+# Threshold hysteresis
 #
-# HESTERISYS=200
+# This value is added to the THRESHOLD value to calculate the off 
+# threshold
+#
+#HYSTERESIS=200
+
+# The value to write the the TRIGGER when switching the backlight on
+#
+# This controls the default brightness
 #
 #VALUE=1
-#
+