diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index b80fb2251..d9919d464 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,3 +1,6 @@
+<!---
+SPDX-License-Identifier: Apache-2.0 WITH SHL-2.1
+--->
 # Contributing
 New Contributors are always welcome.