diff --git a/slhdsa/parameterset.go b/slhdsa/parameterset.go
index f64e470..49b2c01 100644
--- a/slhdsa/parameterset.go
+++ b/slhdsa/parameterset.go
@@ -1,3 +1,9 @@
+// Copyright 2025 Sun Yimin. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+//go:build go1.24
+
 package slhdsa
 
 import "io"