diff --git a/src/drivers/i2c/ptn3460/chip.h b/src/drivers/i2c/ptn3460/chip.h
index 8bd6d9e..2bf7e5e 100644
--- a/src/drivers/i2c/ptn3460/chip.h
+++ b/src/drivers/i2c/ptn3460/chip.h
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 struct drivers_i2c_ptn3460_config {
 
 };