--- old/src/hotspot/share/runtime/objectMonitor.hpp	2020-01-28 14:37:01.000000000 -0500
+++ new/src/hotspot/share/runtime/objectMonitor.hpp	2020-01-28 14:37:01.000000000 -0500
@@ -239,7 +239,9 @@
   // Simply set _owner field to self; current value must match basic_lock_p.
   void      set_owner_from_BasicLock(void* basic_lock_p, Thread* self);
   // Try to set _owner field to new_value if the current value matches
-  // old_value. Otherwise, does not change the _owner field.
+  // old_value. Otherwise, does not change the _owner field. Returns
+  // the prior value of the _owner field. try_set_owner_from() provides:
+  //   <fence> compare-and-exchange <membar StoreLoad|StoreStore>
   void*     try_set_owner_from(void* old_value, void* new_value);
 
   jint      waiters() const;