diff --git a/src/commonlib/Makefile.inc b/src/commonlib/Makefile.inc
index e90ed4f..86e8c56 100644
--- a/src/commonlib/Makefile.inc
+++ b/src/commonlib/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
 subdirs-y += storage
 
 bootblock-y += mem_pool.c