--- ray/src/rt/README	1991/11/12 17:10:24	2.1
+++ ray/src/rt/README	1991/11/25 09:51:12	2.2
@@ -6,6 +6,7 @@ This directory contains the RADIANCE renderers "rpict"
 ambient.h	common definitions for interreflection routines
 data.h		header file for routines which interpolate data
 driver.h	header file for interactive device drivers
+func.h		header file for modifiers using function files
 nwsdev.h	header file for NeWS driver
 otspecial.h	special type flags for objects used in rendering
 ray.h		header file for routines using rays