diff --git a/man/light.1 b/man/light.1
index f3f8e818..5b31a645 100644
--- a/man/light.1
+++ b/man/light.1
@@ -75,6 +75,8 @@ be a func_wall entity with the "_shadow" "1" key set. Default is for
 transparent pixels to block light.
 .IP "\fB\-gamma [n]\fP"
 Adjust brightness of final lightmap. Default 1, >1 is brighter, <1 is darker. See "_gamma" worldspawn key.
+.IP "\fB\-lux\fP"
+Generate a .lux file storing average incoming light directions for surfaces. Usable by FTEQW with "r_deluxemapping 1"
 
 .SH "MODEL ENTITY KEYS"