diff --git a/Documentation/admin-guide/sysctl/abi.rst b/Documentation/admin-guide/sysctl/abi.rst
index d88b48db8bf9..ac87eafdb54f 100644
--- a/Documentation/admin-guide/sysctl/abi.rst
+++ b/Documentation/admin-guide/sysctl/abi.rst
@@ -1,3 +1,5 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
 ================================
 Documentation for /proc/sys/abi/
 ================================