diff --git a/net/smc/smc_cdc.h b/net/smc/smc_cdc.h
index 8e1d76f..bea61da 100644
--- a/net/smc/smc_cdc.h
+++ b/net/smc/smc_cdc.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Shared Memory Communications over RDMA (SMC-R) and RoCE
  *