--- old/src/hotspot/share/gc/shared/gcArguments.hpp	2017-11-29 16:41:19.488823649 +0100
+++ new/src/hotspot/share/gc/shared/gcArguments.hpp	2017-11-29 16:41:19.244814004 +0100
@@ -49,6 +49,10 @@
   void post_heap_initialize();
 
   virtual void initialize_flags();
+
+  // Collector specific function to allow finer grained verification
+  // through VerifyGCType. If not overridden the default version will
+  // warn that the flag is not supported for the given collector.
   virtual bool parse_verification_type(const char* type);
 
   virtual size_t conservative_max_heap_alignment() = 0;