diff --git a/lib/Parse/ParseObjc.cpp b/lib/Parse/ParseObjc.cpp
index c664c64..11417fb 100644
--- a/lib/Parse/ParseObjc.cpp
+++ b/lib/Parse/ParseObjc.cpp
@@ -161,6 +161,7 @@
 ///     __attribute__((deprecated))
 ///     __attribute__((unavailable))
 ///     __attribute__((objc_exception)) - used by NSException on 64-bit
+///     __attribute__((objc_root_class))
 ///
 Decl *Parser::ParseObjCAtInterfaceDeclaration(SourceLocation AtLoc,
                                               ParsedAttributes &attrs) {