diff --git a/internal/warpc/gen/main.go b/internal/warpc/gen/main.go
index 76cd2cce335..d3d6562a93f 100644
--- a/internal/warpc/gen/main.go
+++ b/internal/warpc/gen/main.go
@@ -1,3 +1,16 @@
+// Copyright 2024 The Hugo Authors. All rights reserved.
+//
+// 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.
+
 //go:generate go run main.go
 package main
 
diff --git a/internal/warpc/katex.go b/internal/warpc/katex.go
index 650a1ab1114..23ca726ac60 100644
--- a/internal/warpc/katex.go
+++ b/internal/warpc/katex.go
@@ -1,3 +1,16 @@
+// Copyright 2024 The Hugo Authors. All rights reserved.
+//
+// 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 warpc
 
 import (
diff --git a/internal/warpc/warpc.go b/internal/warpc/warpc.go
index 434e1ce55d1..10a70f3b43a 100644
--- a/internal/warpc/warpc.go
+++ b/internal/warpc/warpc.go
@@ -1,3 +1,16 @@
+// Copyright 2024 The Hugo Authors. All rights reserved.
+//
+// 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 warpc
 
 import (
diff --git a/internal/warpc/warpc_test.go b/internal/warpc/warpc_test.go
index 3de20a0f41f..245831c920f 100644
--- a/internal/warpc/warpc_test.go
+++ b/internal/warpc/warpc_test.go
@@ -1,3 +1,16 @@
+// Copyright 2024 The Hugo Authors. All rights reserved.
+//
+// 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 warpc
 
 import (