--- ray/doc/man/man1/gendaymtx.1	2013/04/30 17:05:27	1.4
+++ ray/doc/man/man1/gendaymtx.1	2018/05/24 15:21:15	1.8
@@ -1,4 +1,4 @@
-.\" RCSid $Id: gendaymtx.1,v 1.4 2013/04/30 17:05:27 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
@@ -7,6 +7,8 @@ gendaymtx - generate an annual Perez sky matrix from a
 [
 .B "\-v"
 ][
+.B "\-h"
+][
 .B "\-d|\-s"
 ][
 .B "\-r deg"
@@ -53,7 +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
@@ -69,6 +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
@@ -101,6 +107,9 @@ The
 .I \-O1
 option specifies that output should be total solar radiance rather
 than visible radiance.
+The
+.I \-h
+option prevents the output of the usual header information.
 Finally, the
 .I \-v
 option will enable verbose reporting, which is mostly useful for
@@ -122,5 +131,5 @@ Ian Ashdown wrote most of the code,
 based on Jean-Jacques Delaunay's original gendaylit(1) implementation.
 Greg Ward wrote the final parameter parsing and weather tape conversion.
 .SH "SEE ALSO"
-dctimestep(1), genBSDF(1), gendaylit(1), gensky(1), genskyvec(1), rcontrib(1),
-xform(1)
+dctimestep(1), genBSDF(1), gendaylit(1), gensky(1), genskyvec(1),
+rcollate(1), rcontrib(1), xform(1)