diff --git a/modules/core/.js/src/main/scala/com/github/tarao/record4s/ArrayRecordPlatformSpecific.scala b/modules/core/.js/src/main/scala/com/github/tarao/record4s/ArrayRecordPlatformSpecific.scala
index 223e897..86bfcf6 100644
--- a/modules/core/.js/src/main/scala/com/github/tarao/record4s/ArrayRecordPlatformSpecific.scala
+++ b/modules/core/.js/src/main/scala/com/github/tarao/record4s/ArrayRecordPlatformSpecific.scala
@@ -1,6 +1,23 @@
+/*
+ * Copyright 2023 record4s 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 com.github.tarao.record4s
 
 import org.getshaka.nativeconverter.NativeConverter
+
 import scala.scalajs.js
 
 trait ArrayRecordPlatformSpecific {
diff --git a/modules/core/.js/src/main/scala/com/github/tarao/record4s/RecordPlatformSpecific.scala b/modules/core/.js/src/main/scala/com/github/tarao/record4s/RecordPlatformSpecific.scala
index 842a3a7..a3cd72d 100644
--- a/modules/core/.js/src/main/scala/com/github/tarao/record4s/RecordPlatformSpecific.scala
+++ b/modules/core/.js/src/main/scala/com/github/tarao/record4s/RecordPlatformSpecific.scala
@@ -1,6 +1,23 @@
+/*
+ * Copyright 2023 record4s 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 com.github.tarao.record4s
 
 import org.getshaka.nativeconverter.{NativeConverter, ParseState}
+
 import scala.compiletime.{constValue, erasedValue, summonInline}
 import scala.scalajs.js
 
diff --git a/modules/core/.js/src/test/scala/com/github/tarao/record4s/JSArrayRecordSpec.scala b/modules/core/.js/src/test/scala/com/github/tarao/record4s/JSArrayRecordSpec.scala
index 11df880..203176f 100644
--- a/modules/core/.js/src/test/scala/com/github/tarao/record4s/JSArrayRecordSpec.scala
+++ b/modules/core/.js/src/test/scala/com/github/tarao/record4s/JSArrayRecordSpec.scala
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2023 record4s 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 com.github.tarao.record4s
 
 import scala.scalajs.js
diff --git a/modules/core/.js/src/test/scala/com/github/tarao/record4s/JSRecordSpec.scala b/modules/core/.js/src/test/scala/com/github/tarao/record4s/JSRecordSpec.scala
index 40259be..df359d9 100644
--- a/modules/core/.js/src/test/scala/com/github/tarao/record4s/JSRecordSpec.scala
+++ b/modules/core/.js/src/test/scala/com/github/tarao/record4s/JSRecordSpec.scala
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2023 record4s 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 com.github.tarao.record4s
 
 import scala.scalajs.js
diff --git a/modules/core/.jvm/src/main/scala/com/github/tarao/record4s/PlatformSpecific.scala b/modules/core/.jvm/src/main/scala/com/github/tarao/record4s/PlatformSpecific.scala
index dd9f97b..ec9d639 100644
--- a/modules/core/.jvm/src/main/scala/com/github/tarao/record4s/PlatformSpecific.scala
+++ b/modules/core/.jvm/src/main/scala/com/github/tarao/record4s/PlatformSpecific.scala
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2023 record4s 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 com.github.tarao.record4s
 
 trait RecordPlatformSpecific
diff --git a/modules/core/.native/src/main/scala/com/github/tarao/record4s/PlatformSpecific.scala b/modules/core/.native/src/main/scala/com/github/tarao/record4s/PlatformSpecific.scala
index dd9f97b..ec9d639 100644
--- a/modules/core/.native/src/main/scala/com/github/tarao/record4s/PlatformSpecific.scala
+++ b/modules/core/.native/src/main/scala/com/github/tarao/record4s/PlatformSpecific.scala
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2023 record4s 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 com.github.tarao.record4s
 
 trait RecordPlatformSpecific