Index: trunk/psphot/src/psphotStackArguments.c
===================================================================
--- trunk/psphot/src/psphotStackArguments.c	(revision 34276)
+++ trunk/psphot/src/psphotStackArguments.c	(revision 34282)
@@ -164,8 +164,10 @@
 
     fprintf (stdout, "# copy and repeat the following block as needed (one per input image set)\n");
-    fprintf (stdout, "# either RAW (unconvolved) or CNV (convolved) input images are required\n");
-    fprintf (stdout, "# if both are supplied, by default RAW is used for detection, CNV is convolved (further) to match target PSF\n");
+    fprintf (stdout, "# RAW (unconvolved) and CNV (convolved) input images are required\n");
+    fprintf (stdout, "# RAW is used for detection and by default for measurements,\n");
+    fprintf (stdout, "# CNV is convolved (further) to match target PSF and is used for radial aperture measurements\n");
+    fprintf (stdout, "# and if PSPHOT.STACK.USE.RAW = F for measurements\n");
     fprintf (stdout, "# if MASK or VARIANCE images are not supplied, they will be generated\n");
-    fprintf (stdout, "# if MASK or VARIANCE images are not supplied, they will be generated\n");
+    fprintf (stdout, "# EXPNUM images are optional. If supplied they are uesd to set the value of NFRAMES\n");
     fprintf (stdout, "# PSF may be supplied for the convolution target\n");
     fprintf (stdout, "INPUT METADATA\n");
@@ -174,4 +176,5 @@
     fprintf (stdout, "  RAW:MASK      STR   file.mk.fits   # mask image filename\n");
     fprintf (stdout, "  RAW:VARIANCE  STR   file.wt.fits   # variance image filename\n");
+    fprintf (stdout, "  RAW:EXPNUM    STR   file.num.fits  # exposure number image filename\n");
     fprintf (stdout, "  RAW:PSF       STR   file.psf.fits  # psf from input unconvolved image\n");
 
@@ -179,4 +182,5 @@
     fprintf (stdout, "  CNV:MASK      STR   file.mk.fits   # mask image filename\n");
     fprintf (stdout, "  CNV:VARIANCE  STR   file.wt.fits   # variance image filename\n");
+    fprintf (stdout, "  CNV:EXPNUM    STR   file.num.fits  # exposure number image filename\n");
     fprintf (stdout, "  CNV:PSF       STR   file.psf.fits  # psf from input convolved image\n");