diff --git a/input/elasticapm/internal/modeldecoder/modeldecoderutil/slice.go b/input/elasticapm/internal/modeldecoder/modeldecoderutil/slice.go
index a050dc4d..e803f8ae 100644
--- a/input/elasticapm/internal/modeldecoder/modeldecoderutil/slice.go
+++ b/input/elasticapm/internal/modeldecoder/modeldecoderutil/slice.go
@@ -1,3 +1,20 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
 package modeldecoderutil
 
 func Reslice[S ~[]E, E any](s S, n int, fn func() E) S {
diff --git a/input/elasticapm/internal/modeldecoder/modeldecoderutil/slice_test.go b/input/elasticapm/internal/modeldecoder/modeldecoderutil/slice_test.go
index a66ae5b2..7a02bde5 100644
--- a/input/elasticapm/internal/modeldecoder/modeldecoderutil/slice_test.go
+++ b/input/elasticapm/internal/modeldecoder/modeldecoderutil/slice_test.go
@@ -1,3 +1,20 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
 package modeldecoderutil
 
 import (