diff --git a/target/linux/ramips/dts/R6350.dts b/target/linux/ramips/dts/R6350.dts
index cdf9a72c86..b3f5281542 100644
--- a/target/linux/ramips/dts/R6350.dts
+++ b/target/linux/ramips/dts/R6350.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 #include "mt7621.dtsi"
diff --git a/target/linux/ramips/dts/WRC-1900GST.dts b/target/linux/ramips/dts/WRC-1900GST.dts
index 550a27b9c1..c910bdeec7 100644
--- a/target/linux/ramips/dts/WRC-1900GST.dts
+++ b/target/linux/ramips/dts/WRC-1900GST.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 #include "elecom_wrc-gst.dtsi"
diff --git a/target/linux/ramips/dts/elecom_wrc-gst.dtsi b/target/linux/ramips/dts/elecom_wrc-gst.dtsi
index 628f0c088b..eb06b0478c 100644
--- a/target/linux/ramips/dts/elecom_wrc-gst.dtsi
+++ b/target/linux/ramips/dts/elecom_wrc-gst.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 #include "mt7621.dtsi"