diff --git a/src/main/scala/uk/ac/soton/ecs/can/types/CanCoreALUFunction.scala b/src/main/scala/uk/ac/soton/ecs/can/types/CanCoreALUFunction.scala
index 59fdd847749611cfecfe80450206052e9b2b632e..660c5df25a29b4a01423c4fe228676a989c1e7df 100644
--- a/src/main/scala/uk/ac/soton/ecs/can/types/CanCoreALUFunction.scala
+++ b/src/main/scala/uk/ac/soton/ecs/can/types/CanCoreALUFunction.scala
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2021 Minyong Li <ml10g20@soton.ac.uk>
+// SPDX-License-Identifier: CERN-OHL-W-2.0
+
 package uk.ac.soton.ecs.can.types
 
 import chisel3.util.log2Ceil