diff --git a/llvm/include/llvm/ADT/None.h b/llvm/include/llvm/ADT/None.h
--- a/llvm/include/llvm/ADT/None.h
+++ b/llvm/include/llvm/ADT/None.h
@@ -22,6 +22,6 @@
 // (constant value 1 in an attempt to workaround MSVC build issue... )
 enum class NoneType { None = 1 };
 const NoneType None = NoneType::None;
-}
+} // end namespace llvm
 
 #endif