diff --git a/TODO b/TODO
index 4e98381..2c6d014 100644
--- a/TODO
+++ b/TODO
@@ -1,6 +1,9 @@
 [ ] Add a config file
 [ ] Use a better filter than a simple median, maybe a kalman filter
 [ ] Add a way to customise the brightness curve
+	Percieved brightness is not linear, on low light you need a slightly higher
+	brightness and on high light you can get away with a lower brightness
+	than the max, the goal is to find the right curve for the screen
 [ ] Automatically detect backlight device, or at least make it configurable
 [ ] Add signal handlers
 	[ ] SIGUSR1 to reset the user offset