Index: trunk/ippScripts/scripts/magic_process.pl
===================================================================
--- trunk/ippScripts/scripts/magic_process.pl	(revision 30599)
+++ trunk/ippScripts/scripts/magic_process.pl	(revision 30600)
@@ -151,4 +151,8 @@
             &my_die("failed to resolve inputs", $magic_id, $node, $PS_EXIT_DATA_ERROR);
         }
+
+	# to run magic on a diff image, we need the convolved version
+	# of the corresponding TEMPLATE image
+	# (see diff_skycell.pl:124)
 
         my $diff_base = $innode->{diff_path_base}; # Base name for diff