diff --git a/Documentation/trace/stm.rst b/Documentation/trace/stm.rst
index 944994fd6368..99f99963e5e7 100644
--- a/Documentation/trace/stm.rst
+++ b/Documentation/trace/stm.rst
@@ -1,3 +1,5 @@
+.. SPDX-License-Identifier: GPL-2.0
+
 ===================
 System Trace Module
 ===================