diff --git a/lib/CodeGen/AsmPrinter/DIE.h b/lib/CodeGen/AsmPrinter/DIE.h
index 84a88961d7d..fa23fa889e3 100644
--- a/lib/CodeGen/AsmPrinter/DIE.h
+++ b/lib/CodeGen/AsmPrinter/DIE.h
@@ -184,7 +184,8 @@ public:
 };
 
 //===--------------------------------------------------------------------===//
-/// DIEValue - A debug information entry value.
+/// DIEValue - A debug information entry value. Some of these roughly correlate
+/// to DWARF attribute classes.
 ///
 class DIEValue {
   virtual void anchor();