--- ray/doc/man/man1/rcollate.1	2013/09/06 21:34:38	1.3
+++ ray/doc/man/man1/rcollate.1	2014/05/30 00:00:54	1.5
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: rcollate.1,v 1.3 2013/09/06 21:34:38 greg Exp $"
+.\" RCSid "$Id: rcollate.1,v 1.5 2014/05/30 00:00:54 greg Exp $"
 .TH RCOLLATE 1 7/8/97 RADIANCE
 .SH NAME
 rcollate - resize or transpose matrix data
@@ -69,6 +69,16 @@ Note that the lack of row separators in binary files m
 does not actually do anything for binary files unless the transpose
 option is given, also.
 .PP
+If an input header is present, it may contain the format, number of components
+and matrix dimensions.
+In such cases, the
+.I \-ic,
+.I \-ir
+and
+.I \-f
+options are not required, but will be checked against the header
+information if provided.
+.PP
 The transpose option,
 .I \-t
 swaps rows and columns on the input.
@@ -88,7 +98,7 @@ For large transpose operations on Unix systems, it is 
 to specify the input file on the command line, rather than reading
 from the standard input, since
 .I rcollate
-can map the file directly into memory.
+can map the file directly into virtual memory.
 .SH EXAMPLE
 To change put 8760 color triplets per row in a matrix with no header:
 .IP "" .2i