diff --git a/clang/include/clang/ExtractAPI/API.h b/clang/include/clang/ExtractAPI/API.h
--- a/clang/include/clang/ExtractAPI/API.h
+++ b/clang/include/clang/ExtractAPI/API.h
@@ -380,6 +380,7 @@
   virtual void anchor();
 };
 
+/// This holds information associated with macro definitions.
 struct MacroDefinitionRecord : APIRecord {
   MacroDefinitionRecord(StringRef Name, StringRef USR, PresumedLoc Loc,
                         DeclarationFragments Declaration,