diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index 95f5459ed2c9..96ce91b7d9a8 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -1,3 +1,5 @@
+.. SPDX-License-Identifier: GPL-2.0
+
 =========================
 Linux Hardware Monitoring
 =========================