Index: trunk/doc/pslib/psLibSDRS.tex
===================================================================
--- trunk/doc/pslib/psLibSDRS.tex	(revision 3971)
+++ trunk/doc/pslib/psLibSDRS.tex	(revision 3992)
@@ -1,3 +1,3 @@
-%%% $Id: psLibSDRS.tex,v 1.230 2005-05-19 02:15:07 price Exp $
+%%% $Id: psLibSDRS.tex,v 1.231 2005-05-20 00:43:57 price Exp $
 \documentclass[panstarrs,spec]{panstarrs}
 
@@ -2726,7 +2726,8 @@
 coordinates.  The second function converts the IRAF description of a
 region in the form \code{[x0:x1,y0:y1]}, used for header entries such
-as \code{BIASSEC}, into the corresponding \code{psRegion} structure.
-We also define a function that converts a \code{psRegion} to the
-corresponding IRAF description.
+as \code{BIASSEC}, into the corresponding \code{psRegion} structure
+(any values that do not parse correctly shall be returned as
+\code{NaN}).  We also define a function that converts a
+\code{psRegion} to the corresponding IRAF description.
 
 \begin{verbatim}