diff --git a/lib/libc/include/x86_64-macos-gnu/stdint.h b/lib/libc/include/x86_64-macos-gnu/stdint.h
index f4bb4cd758..87c93c7d69 100644
--- a/lib/libc/include/x86_64-macos-gnu/stdint.h
+++ b/lib/libc/include/x86_64-macos-gnu/stdint.h
@@ -3,6 +3,15 @@
  * All rights reserved.
  */
 
+/*
+ * Note from the Zig project:
+ *
+ * Apple released their libc as a whole under the APSL 2.0 license [1], which
+ * includes this file. Therefore, this file is governed by the APSL 2.0 license.
+ *
+ * [1]: https://opensource.apple.com/source/Libc/Libc-1353.100.2/
+ */
+
 #ifndef _STDINT_H_
 #define _STDINT_H_