Index: trunk/ppSub/src/ppSubArguments.c
===================================================================
--- trunk/ppSub/src/ppSubArguments.c	(revision 20492)
+++ trunk/ppSub/src/ppSubArguments.c	(revision 20506)
@@ -214,4 +214,5 @@
     psMetadataAddS32(arguments, PS_LIST_TAIL, "-iter", 0, "Number of rejection iterations", -1);
     psMetadataAddF32(arguments, PS_LIST_TAIL, "-rej", 0, "Rejection thresold (sigma)", NAN);
+    psMetadataAddF32(arguments, PS_LIST_TAIL, "-sys", 0, "Relative systematic error in kernel", NAN);
     psMetadataAddU8(arguments,  PS_LIST_TAIL, "-mask-bad", 0, "Mask value for bad pixels", 0);
     psMetadataAddU8(arguments,  PS_LIST_TAIL, "-mask-poor", 0, "Mask value for poor pixels", 0);
@@ -302,4 +303,5 @@
     VALUE_ARG_RECIPE_INT("-iter",         "ITER",            S32, -1);
     VALUE_ARG_RECIPE_FLOAT("-rej",        "REJ",             F32);
+    VALUE_ARG_RECIPE_FLOAT("-sys",        "SYS",             F32);
     VALUE_ARG_RECIPE_FLOAT("-badfrac",    "BADFRAC",         F32);
     VALUE_ARG_RECIPE_FLOAT("-penalty",    "PENALTY",         F32);