Index: trunk/psphot/src/psphotStackArguments.c
===================================================================
--- trunk/psphot/src/psphotStackArguments.c	(revision 34275)
+++ trunk/psphot/src/psphotStackArguments.c	(revision 34276)
@@ -170,4 +170,5 @@
     fprintf (stdout, "# PSF may be supplied for the convolution target\n");
     fprintf (stdout, "INPUT METADATA\n");
+    fprintf (stdout, "  STACK_ID      S64   123456789      # stack_id for the input image\n");
     fprintf (stdout, "  RAW:IMAGE     STR   file.im.fits   # signal image filename\n");
     fprintf (stdout, "  RAW:MASK      STR   file.mk.fits   # mask image filename\n");