--- ray/doc/man/man1/rcomb.1	2023/12/12 16:31:45	1.1
+++ ray/doc/man/man1/rcomb.1	2024/01/17 21:50:15	1.5
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: rcomb.1,v 1.1 2023/12/12 16:31:45 greg Exp $"
+.\" RCSid "$Id: rcomb.1,v 1.5 2024/01/17 21:50:15 greg Exp $"
 .TH RCOMB 12/5/2023 RADIANCE
 .SH NAME
 rcomb - combine and convert matrices a row at a time
@@ -94,7 +94,7 @@ will be undone, similar to the
 option.
 Radiance spectral pictures with more than 3 components are also supported.
 These are typically produced by
-.I rtrace(1)
+.I rtpict(1)
 or
 .I rfluxmtx(1).
 .PP
@@ -144,6 +144,9 @@ option is given, the output will be written as a RGBE 
 Note that conversion from a float or RGBE color space applies a conversion
 of 179 lumens/watt (for CIE or melanopic output) or 412 (for scotopic output),
 and the reverse happens for conversion from XYZE input to RGB or RGBE output.
+Lower case versions of all these components are also supported, the only
+difference is that the aforementioned efficacy factors
+will be left out of the conversion.
 .PP
 If a matrix or picture file path is given to the
 .I \-c
@@ -195,6 +198,10 @@ by the "r" and "c" variables, where
 goes from 0 to "nrows" minus one, and
 .I c
 goes from 0 to "ncols" minus one.
+(Note that "nrows" may be zero if unspecified in inputs, and this
+is a unique capability of
+.I rcomb
+to handle these.)\0
 Component p from input i is accessed with the "ci(i,p)" function,
 and the number of components is defined by the "ncomp" constant.
 If given as "ci(i)", the function returns the current component
@@ -323,6 +330,12 @@ is not supported in
 .I rcomb,
 and should instead be handled by
 .I pfilt(1).
+.SH BUGS
+The
+.I rcomb
+command currently ignores the "PRIMARIES" setting in input
+headers, and does not produce any on output, even in
+circumstances where it would make sense to.
 .SH AUTHOR
 Greg Ward
 .SH "SEE ALSO"