Index: trunk/ippScripts/scripts/diff_skycell.pl
===================================================================
--- trunk/ippScripts/scripts/diff_skycell.pl	(revision 17787)
+++ trunk/ippScripts/scripts/diff_skycell.pl	(revision 17788)
@@ -37,5 +37,5 @@
 pod2usage( -msg => "Unknown option: @ARGV", -exitval => 2 ) if @ARGV;
 pod2usage(
-    -msg => "Required options: --diff_id",
+    -msg => "Required options: --diff_id --outroot",
     -exitval => 3,
           ) unless defined $diff_id