Index: /trunk/ppSub/src/ppSubArguments.c
===================================================================
--- /trunk/ppSub/src/ppSubArguments.c	(revision 14363)
+++ /trunk/ppSub/src/ppSubArguments.c	(revision 14364)
@@ -281,4 +281,6 @@
     } else if (strcasecmp(type, "GUNK") == 0) {
         kernelType = PM_SUBTRACTION_KERNEL_GUNK;
+    } else if (strcasecmp(type, "RINGS") == 0) {
+        kernelType = PM_SUBTRACTION_KERNEL_RINGS;
     } else {
         psError(PS_ERR_BAD_PARAMETER_VALUE, true, "Unrecognised kernel type: %s", type);