Index: trunk/ppSub/src/ppSubArguments.c
===================================================================
--- trunk/ppSub/src/ppSubArguments.c	(revision 24833)
+++ trunk/ppSub/src/ppSubArguments.c	(revision 26076)
@@ -86,4 +86,5 @@
     psMetadataAddS32(arguments, PS_LIST_TAIL, "-convolve", 0, "Image to convolve [1 or 2]", 0);
     psMetadataAddBool(arguments, PS_LIST_TAIL, "-photometry", 0, "Perform photometry?", NULL);
+    psMetadataAddF32(arguments, PS_LIST_TAIL, "-zp", 0, "Zero point for photometry", NAN);
     psMetadataAddBool(arguments, PS_LIST_TAIL, "-inverse", 0, "Generate inverse subtractions?", NULL);
     psMetadataAddBool(arguments, PS_LIST_TAIL, "-visual", 0, "Show diagnostic plots", NULL);