Index: /trunk/ppSub/src/ppSubArguments.c
===================================================================
--- /trunk/ppSub/src/ppSubArguments.c	(revision 14572)
+++ /trunk/ppSub/src/ppSubArguments.c	(revision 14573)
@@ -197,5 +197,5 @@
     psMetadataAddBool(arguments,  PS_LIST_TAIL, "-reverse", 0, "Reverse sense of subtraction?", false);
     psMetadataAddBool(arguments,  PS_LIST_TAIL, "-generate-mask", 0, "Generate mask if not supplied?", false);
-    psMetadataAddStr(arguments,  PS_LIST_TAIL, "-stamps", 0, "Stamps filename", NULL);
+    psMetadataAddStr(arguments,  PS_LIST_TAIL, "-stamps", 0, "Stamps filename; file has x,y on each line", NULL);
 
     if (argc == 1 || !psArgumentParse(arguments, &argc, argv) || argc != 4) {