diff --git a/libcxx/benchmarks/random.bench.cpp b/libcxx/benchmarks/random.bench.cpp
--- a/libcxx/benchmarks/random.bench.cpp
+++ b/libcxx/benchmarks/random.bench.cpp
@@ -1,3 +1,9 @@
+//===----------------------------------------------------------------------===//
+// 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
+//
+//===----------------------------------------------------------------------===//
 
 #include <algorithm>
 #include <array>