Index: trunk/ppSub/src/ppSubArguments.c
===================================================================
--- trunk/ppSub/src/ppSubArguments.c	(revision 14362)
+++ 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);