1 files changed, 8 insertions, 4 deletions
diff --git a/include/clang/Basic/TargetOptions.h b/include/clang/Basic/TargetOptions.h
index fcccc5331a..bbe86aebb0 100644
--- a/include/clang/Basic/TargetOptions.h
+++ b/include/clang/Basic/TargetOptions.h
@@ -1,9 +1,8 @@
 //===--- TargetOptions.h ----------------------------------------*- C++ -*-===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 ///
@@ -76,6 +75,11 @@ public:
   std::string CodeModel;
 
   /// The version of the SDK which was used during the compilation.
+  /// The option is used for two different purposes:
+  /// * on darwin the version is propagated to LLVM where it's used
+  ///   to support SDK Version metadata (See D55673).
+  /// * CUDA compilation uses it to control parts of CUDA compilation
+  ///   in clang that depend on specific version of the CUDA SDK.
   llvm::VersionTuple SDKVersion;
 };