diff -ur redshift-1.3/README redshift-1.3_reset/README
--- redshift-1.3/README	2010-05-05 14:08:04.000000000 -0700
+++ redshift-1.3_reset/README	2010-06-08 21:22:31.000000000 -0700
@@ -68,6 +68,7 @@
   -s SCREEN	X screen to apply adjustments to.
   -c CRTC	CRTC to apply adjustments to (RANDR only)
   -t DAY:NIGHT	Color temperature to set at daytime/night.
+  -x		Reset color temperature to default (same as -o -t 6500:6500)
 
 Example (location is Copenhagen, Denmark):