diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..a12940f
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,24 @@
+MAKEFLAGS=--warn-undefined-variables
+# /bin/sh is dash on Debian which does not support all features of ash/bash
+# to fix that we use /bin/bash only on Debian to not break Alpine
+ifneq (,$(wildcard /etc/os-release)) # check file existence
+	ifneq ($(shell grep -c debian /etc/os-release),0)
+		SHELL := /bin/bash
+	endif
+endif
+
+prepare-static-check: FORCE
+	@if ! hash addlicense 2>/dev/null; then  printf "\e[1;36m>> Installing addlicense...\e[0m\n";  go install github.com/google/addlicense@latest; fi
+
+license-headers: FORCE prepare-static-check
+	@printf "\e[1;36m>> addlicense\e[0m\n"
+	@addlicense -c "SAP SE" -- $(shell find -name *.rs)
+
+check-license-headers: FORCE prepare-static-check
+	@printf "\e[1;36m>> addlicense --check\e[0m\n"
+	@addlicense --check -- $(shell find -name *.rs)
+
+clean: FORCE
+	git clean -dxf build
+
+.PHONY: FORCE
diff --git a/src/api_clients.rs b/src/api_clients.rs
index 008e6c0..39c147d 100644
--- a/src/api_clients.rs
+++ b/src/api_clients.rs
@@ -1,3 +1,17 @@
+// Copyright 2024 SAP SE
+//
+// 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.
+
 use std::collections::HashMap;
 use std::env;
 use std::sync::Arc;
diff --git a/src/changes.rs b/src/changes.rs
index 7796d42..21c3360 100644
--- a/src/changes.rs
+++ b/src/changes.rs
@@ -1,3 +1,17 @@
+// Copyright 2024 SAP SE
+//
+// 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.
+
 use anyhow::{anyhow, Context};
 use octocrab::models::commits::Commit;
 use octocrab::models::pulls::Review;
diff --git a/src/helm_config.rs b/src/helm_config.rs
index a9ba3ab..20ecebb 100644
--- a/src/helm_config.rs
+++ b/src/helm_config.rs
@@ -1,3 +1,17 @@
+// Copyright 2024 SAP SE
+//
+// 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.
+
 use std::collections::HashMap;
 
 use anyhow::Context;
diff --git a/src/main.rs b/src/main.rs
index 3e324f2..ee974d9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,17 @@
+// Copyright 2024 SAP SE
+//
+// 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.
+
 #![warn(clippy::pedantic)]
 
 mod api_clients;
diff --git a/src/remote.rs b/src/remote.rs
index 8de372a..21e8e1f 100644
--- a/src/remote.rs
+++ b/src/remote.rs
@@ -1,3 +1,17 @@
+// Copyright 2024 SAP SE
+//
+// 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.
+
 use std::sync::Arc;
 
 use anyhow::{anyhow, Context};
diff --git a/src/repo.rs b/src/repo.rs
index 6830eca..fa20807 100644
--- a/src/repo.rs
+++ b/src/repo.rs
@@ -1,3 +1,17 @@
+// Copyright 2024 SAP SE
+//
+// 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.
+
 use anyhow::Context;
 use git2::{Repository, Tree};