--- ray/doc/man/man1/gendaymtx.1	2014/05/30 00:00:54	1.6
+++ ray/doc/man/man1/gendaymtx.1	2018/05/24 15:21:15	1.8
@@ -1,4 +1,4 @@
-.\" RCSid $Id: gendaymtx.1,v 1.6 2014/05/30 00:00:54 greg Exp $
+.\" RCSid $Id: gendaymtx.1,v 1.8 2018/05/24 15:21:15 greg Exp $
 .TH GENDAYMTX 1 01/19/13 RADIANCE
 .SH NAME
 gendaymtx - generate an annual Perez sky matrix from a weather tape
@@ -55,7 +55,7 @@ yield 8760x3 (26280) values per output line (row).
 The
 .I \-c
 option may be used to specify a color for the sky.
-The gray value should equal 1 for proper energy balance
+The gray value should equal 1 for proper energy balance.
 The default sky color is
 .I "\-c 0.960 1.004 1.118".
 Similarly, the
@@ -71,6 +71,10 @@ option may be used to produce a sun-only matrix, with 
 Alternatively, the
 .I \-s
 option may be used to exclude any direct solar component from the output.
+If there is a sun in the description,
+.I gendaymtx
+will include its contribution in the four nearest sky patches,
+distributing energy according to centroid proximity.
 .PP
 By default,
 .I gendaymtx