diff a/src/hotspot/share/memory/allocation.hpp b/src/hotspot/share/memory/allocation.hpp
--- a/src/hotspot/share/memory/allocation.hpp
+++ b/src/hotspot/share/memory/allocation.hpp
@@ -182,10 +182,11 @@
 char* ReallocateHeap(char *old,
                      size_t size,
                      MEMFLAGS flag,
                      AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
 
+// handles NULL pointers
 void FreeHeap(void* p);
 
 template <MEMFLAGS F> class CHeapObj ALLOCATION_SUPER_CLASS_SPEC {
  public:
   ALWAYSINLINE void* operator new(size_t size) throw() {