diff -r 8bb47943a8dd -r 0b48f0aa79ec src/hotspot/share/classfile/classLoaderData.hpp
--- a/src/hotspot/share/classfile/classLoaderData.hpp	Tue Mar 06 16:02:04 2018 -0800
+++ b/src/hotspot/share/classfile/classLoaderData.hpp	Tue Mar 06 22:08:30 2018 -0800
@@ -331,7 +331,13 @@
   bool is_the_null_class_loader_data() const {
     return this == _the_null_class_loader_data;
   }
+
+  // Returns true if this class loader data is for the system class loader.
+  // (Note that the class loader data may be anonymous.)
   bool is_system_class_loader_data() const;
+
+  // Returns true if this class loader data is for the platform class loader.
+  // (Note that the class loader data may be anonymous.)
   bool is_platform_class_loader_data() const;
 
   // Returns true if this class loader data is for the boot class loader.