Index: trunk/psphot/src/psphotDefinePixels.c
===================================================================
--- trunk/psphot/src/psphotDefinePixels.c	(revision 6056)
+++ trunk/psphot/src/psphotDefinePixels.c	(revision 6311)
@@ -1,4 +1,5 @@
 # include "psphot.h"
 
+// x,y are defined in the parent image coords of readout->image
 bool psphotDefinePixels(pmSource *mySource, 
 			const pmReadout *readout,