diff --git a/Documentation/driver-api/index.rst b/Documentation/driver-api/index.rst
index b208e0dac3a0..7a2584ab63c4 100644
--- a/Documentation/driver-api/index.rst
+++ b/Documentation/driver-api/index.rst
@@ -1,3 +1,5 @@
+.. SPDX-License-Identifier: GPL-2.0
+
 ==============================
 Driver implementer's API guide
 ==============================