diff --git a/build.sbt b/build.sbt
index 84955aa1fec6e1b1b26ad649c4d32ab99779a9e5..d44ef4536a8a95fc44cd15a6014eefddabcc054b 100644
--- a/build.sbt
+++ b/build.sbt
@@ -22,12 +22,12 @@ ThisBuild / libraryDependencySchemes ++= Seq(
 
 addCommandAlias("compileBenchmarks", "benchmarks/Jmh/compile")
 addCommandAlias("compileSources", "example/Test/compile; redis/Test/compile")
-addCommandAlias("check", "fixCheck; fmtCheck")
+addCommandAlias("check", "fixCheck; fmtCheck; headerCheck")
 addCommandAlias("fix", "scalafixAll")
 addCommandAlias("fixCheck", "scalafixAll --check")
 addCommandAlias("fmt", "all scalafmtSbt scalafmtAll")
 addCommandAlias("fmtCheck", "all scalafmtSbtCheck scalafmtCheckAll")
-addCommandAlias("prepare", "fix; fmt")
+addCommandAlias("prepare", "fix; fmt; headerCreate")
 
 lazy val root =
   project
diff --git a/redis/src/main/scala/zio/redis/RedisClusterConfig.scala b/redis/src/main/scala/zio/redis/RedisClusterConfig.scala
index c8e2a7f0b6c92a6f66f77552092061b51f83909f..5504fd93dbb1537276a1909e5fd308f8954a7d93 100644
--- a/redis/src/main/scala/zio/redis/RedisClusterConfig.scala
+++ b/redis/src/main/scala/zio/redis/RedisClusterConfig.scala
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2021 John A. De Goes and the ZIO contributors
+ *
+ * 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 zio.redis
 
 import zio.{Chunk, Duration, durationInt}
diff --git a/redis/src/main/scala/zio/redis/RedisConnectionLive.scala b/redis/src/main/scala/zio/redis/RedisConnectionLive.scala
index e438c1c2cb92b648a922f308bdc9e508ebc38547..4e5284586cbbc39770e87c84a19fb90f9cc00d2b 100644
--- a/redis/src/main/scala/zio/redis/RedisConnectionLive.scala
+++ b/redis/src/main/scala/zio/redis/RedisConnectionLive.scala
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2021 John A. De Goes and the ZIO contributors
+ *
+ * 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 zio.redis
 
 import zio._
diff --git a/redis/src/main/scala/zio/redis/RedisEnvironment.scala b/redis/src/main/scala/zio/redis/RedisEnvironment.scala
index ece66e6c8035083bfbdb1f62ffd2679678323f58..49415baa0c0d966a312e69821992a2b885653d5e 100644
--- a/redis/src/main/scala/zio/redis/RedisEnvironment.scala
+++ b/redis/src/main/scala/zio/redis/RedisEnvironment.scala
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2021 John A. De Goes and the ZIO contributors
+ *
+ * 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 zio.redis
 
 import zio.schema.codec.BinaryCodec
diff --git a/redis/src/main/scala/zio/redis/RedisExecutor.scala b/redis/src/main/scala/zio/redis/RedisExecutor.scala
index 0ea6af53379ffd95c20a37723a6d558adf4ece87..8c228a19abefc9f9bb6ae80daaff911b54ed4a91 100644
--- a/redis/src/main/scala/zio/redis/RedisExecutor.scala
+++ b/redis/src/main/scala/zio/redis/RedisExecutor.scala
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2021 John A. De Goes and the ZIO contributors
+ *
+ * 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 zio.redis
 
 import zio.{Chunk, IO, ZLayer}
diff --git a/redis/src/main/scala/zio/redis/RedisUri.scala b/redis/src/main/scala/zio/redis/RedisUri.scala
index 4e4353524cac566ddad01b8734d237bbd61ec80f..e5b5b1ae8b3120ec3f0cc04ccbbfa52081416042 100644
--- a/redis/src/main/scala/zio/redis/RedisUri.scala
+++ b/redis/src/main/scala/zio/redis/RedisUri.scala
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2021 John A. De Goes and the ZIO contributors
+ *
+ * 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 zio.redis
 
 final case class RedisUri(host: String, port: Int) {
diff --git a/redis/src/main/scala/zio/redis/codecs/CRC16.scala b/redis/src/main/scala/zio/redis/codecs/CRC16.scala
index e26fbd802940659c37e4d781d5c37a26d44f8773..c68789a4027f11ff1e75172d60f4ba94e0bbfe05 100644
--- a/redis/src/main/scala/zio/redis/codecs/CRC16.scala
+++ b/redis/src/main/scala/zio/redis/codecs/CRC16.scala
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2021 John A. De Goes and the ZIO contributors
+ *
+ * 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 zio.redis.codecs
 
 import zio.Chunk
diff --git a/redis/src/main/scala/zio/redis/codecs/StringUtf8Codec.scala b/redis/src/main/scala/zio/redis/codecs/StringUtf8Codec.scala
index b4194ad118029252ee3ab9c0f5cf87c52feab0e5..ae6e429891e61c10a64db94ddad50f10919bc1f9 100644
--- a/redis/src/main/scala/zio/redis/codecs/StringUtf8Codec.scala
+++ b/redis/src/main/scala/zio/redis/codecs/StringUtf8Codec.scala
@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package zio.redis.codecs
 
 import zio.redis.RedisError.CodecError
diff --git a/redis/src/main/scala/zio/redis/options/Cluster.scala b/redis/src/main/scala/zio/redis/options/Cluster.scala
index 5c11752c4f812232f9a10ddb549a686ec4c77dae..c6af2f082c7c131713d17f54579cc9614bfc899e 100644
--- a/redis/src/main/scala/zio/redis/options/Cluster.scala
+++ b/redis/src/main/scala/zio/redis/options/Cluster.scala
@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package zio.redis.options
 
 import zio.redis.{RedisExecutor, RedisUri}