--- ray/doc/man/man1/rcomb.1	2025/03/27 01:26:55	1.12
+++ ray/doc/man/man1/rcomb.1	2025/06/19 22:36:53	1.14
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: rcomb.1,v 1.12 2025/03/27 01:26:55 greg Exp $"
+.\" RCSid "$Id: rcomb.1,v 1.14 2025/06/19 22:36:53 greg Exp $"
 .TH RCOMB 12/5/2023 RADIANCE
 .SH NAME
 rcomb - combine and convert matrices a row at a time
@@ -25,7 +25,7 @@ rcomb - combine and convert matrices a row at a time
 ]
 .B "m1 .."
 [
-.B "\-m mcat"
+.B "\-m[t] mcat"
 ]
 .SH DESCRIPTION
 .I Rcomb
@@ -60,6 +60,9 @@ A single concatenation matrix may be applied after ele
 using the
 .I \-m
 option.
+If the option is given as
+.I \-mt
+then the concatenation matrix will be transposed before it is applied.
 Matrix concatenation will happen before or after any trailing
 operations, depending on relative command line placement.
 .PP
@@ -339,6 +342,14 @@ is not supported in
 .I rcomb,
 and should instead be handled by
 .I pfilt(1).
+.PP
+Similar to
+.I rmtxop,
+all calculations are peformed internally using 32-bit floating-point,
+so there is little benefit in either reading or writing 64-bit double
+data.
+This may be overridden at compile time using the macro
+"-DDTrmx_native=DTdouble".
 .SH BUGS
 The
 .I rcomb