--- ray/doc/man/man1/gendaymtx.1	2013/02/05 19:31:40	1.3
+++ ray/doc/man/man1/gendaymtx.1	2013/04/30 17:05:27	1.4
@@ -1,4 +1,4 @@
-.\" RCSid $Id: gendaymtx.1,v 1.3 2013/02/05 19:31:40 greg Exp $
+.\" RCSid $Id: gendaymtx.1,v 1.4 2013/04/30 17:05:27 greg Exp $
 .TH GENDAYMTX 1 01/19/13 RADIANCE
 .SH NAME
 gendaymtx - generate an annual Perez sky matrix from a weather tape
@@ -18,6 +18,8 @@ gendaymtx - generate an annual Perez sky matrix from a
 .B "\-c r g b"
 ][
 .B "-o{f|d}"
+][
+.B "-O{0|1}"
 ]
 [
 .B "tape.wea"
@@ -95,6 +97,10 @@ option may be used to specify binary float or double o
 This is much faster to write and to read, and is therefore preferred on
 systems that support it.
 (MS Windows is not one of them.)\0
+The
+.I \-O1
+option specifies that output should be total solar radiance rather
+than visible radiance.
 Finally, the
 .I \-v
 option will enable verbose reporting, which is mostly useful for