diff --git a/prometheus/promsafe/safe.go b/prometheus/promsafe/safe.go
index 25e9ee899..019210b66 100644
--- a/prometheus/promsafe/safe.go
+++ b/prometheus/promsafe/safe.go
@@ -1,3 +1,16 @@
+// Copyright 2024 The Prometheus Authors
+// Licensed 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 promsafe provides safe labeling - strongly typed labels in prometheus metrics.
 // Enjoy promsafe as you wish!
 package promsafe
diff --git a/prometheus/promsafe/safe_test.go b/prometheus/promsafe/safe_test.go
index 6517b66fc..d0f65c215 100644
--- a/prometheus/promsafe/safe_test.go
+++ b/prometheus/promsafe/safe_test.go
@@ -1,3 +1,16 @@
+// Copyright 2024 The Prometheus Authors
+// Licensed 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 promsafe_test
 
 import (