Index: trunk/ippTools/src/difftoolConfig.c
===================================================================
--- trunk/ippTools/src/difftoolConfig.c	(revision 14358)
+++ trunk/ippTools/src/difftoolConfig.c	(revision 15376)
@@ -126,4 +126,6 @@
     psMetadataAddF64(adddiffskyfileArgs, PS_LIST_TAIL, "-bg_stdev",  0,
             "define exposure background mean stdev", NAN);
+    psMetadataAddF64(adddiffskyfileArgs, PS_LIST_TAIL, "-good_frac",  0,
+            "define %% of good pixels", NAN);
     psMetadataAddS16(adddiffskyfileArgs, PS_LIST_TAIL, "-code",  0,
             "set fault code", 0);