--- ray/doc/man/man1/mkpmap.1	2015/06/05 08:48:09	1.2
+++ ray/doc/man/man1/mkpmap.1	2016/05/18 12:45:55	1.3
@@ -1,5 +1,5 @@
-.\" RCSid "$Id: mkpmap.1,v 1.2 2015/06/05 08:48:09 rschregle Exp $"
-.TH MKPMAP 1 "$Date: 2015/06/05 08:48:09 $ $Revision: 1.2 $" RADIANCE
+.\" RCSid "$Id: mkpmap.1,v 1.3 2016/05/18 12:45:55 rschregle Exp $"
+.TH MKPMAP 1 "$Date: 2016/05/18 12:45:55 $ $Revision: 1.3 $" RADIANCE
 
 .SH NAME
 mkpmap - generate RADIANCE photon map
@@ -206,6 +206,10 @@ with the \fB\-apv\fR option. See \fIrpict(1)\fR for de
 .IP "\fB\-mg \fIgecc\fR"
 Set the global scattering eccentricity for participating media in conjunction
 with the \fB\-apv\fR option. See \fIrpict(1)\fR for details.
+
+.IP "\fB\-n \fInproc\fR"
+Use \fInproc\fR processes for parallel photon distribution. There is no
+benefit in specifying more than the number of physical CPU cores available.
 
 .IP "\fB\-t \fIinterval\fR"
 Output a progress report every \fIinterval\fR seconds. This includes