diff --git a/build.rs b/build.rs
index 34258bf..1505a42 100644
--- a/build.rs
+++ b/build.rs
@@ -1,3 +1,22 @@
+/********************************************************************************
+ * Prometheus exporter for monitoring network connectivity using icmp pings *
+ * *
+ * Copyright (C) 2019-2022 Jan Christian Grünhage *
+ * Copyright (C) 2020-2021 Famedly GmbH *
+ * *
+ * This program is free software: you can redistribute it and/or modify *
+ * it under the terms of the GNU Affero General Public License as *
+ * published by the Free Software Foundation, either version 3 of the *
+ * License, or (at your option) any later version. *
+ * *
+ * This program is distributed in the hope that it will be useful, *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
+ * GNU Affero General Public License for more details. *
+ * *
+ * You should have received a copy of the GNU Affero General Public License *
+ * along with this program. If not, see . *
+ ********************************************************************************/
use std::path::PathBuf;
use clap::{ArgEnum, CommandFactory};
diff --git a/src/cli.rs b/src/cli.rs
index c7112dd..bf7e638 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -1,3 +1,22 @@
+/********************************************************************************
+ * Prometheus exporter for monitoring network connectivity using icmp pings *
+ * *
+ * Copyright (C) 2019-2022 Jan Christian Grünhage *
+ * Copyright (C) 2020-2021 Famedly GmbH *
+ * *
+ * This program is free software: you can redistribute it and/or modify *
+ * it under the terms of the GNU Affero General Public License as *
+ * published by the Free Software Foundation, either version 3 of the *
+ * License, or (at your option) any later version. *
+ * *
+ * This program is distributed in the hope that it will be useful, *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
+ * GNU Affero General Public License for more details. *
+ * *
+ * You should have received a copy of the GNU Affero General Public License *
+ * along with this program. If not, see . *
+ ********************************************************************************/
use clap::ValueHint;
#[derive(clap::Parser)]
diff --git a/src/config.rs b/src/config.rs
index 874ed79..22474fb 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -1,8 +1,8 @@
/********************************************************************************
* Prometheus exporter for monitoring network connectivity using icmp pings *
* *
- * Copyright (C) 2019-2020 Jan Christian Grünhage *
- * Copyright (C) 2020 Famedly GmbH *
+ * Copyright (C) 2019-2022 Jan Christian Grünhage *
+ * Copyright (C) 2020-2021 Famedly GmbH *
* *
* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU Affero General Public License as *
diff --git a/src/main.rs b/src/main.rs
index 154ace9..d84d97d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,8 +1,8 @@
/********************************************************************************
* Prometheus exporter for monitoring network connectivity using icmp pings *
* *
- * Copyright (C) 2019-2020 Jan Christian Grünhage *
- * Copyright (C) 2020 Famedly GmbH *
+ * Copyright (C) 2019-2022 Jan Christian Grünhage *
+ * Copyright (C) 2020-2021 Famedly GmbH *
* *
* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU Affero General Public License as *
diff --git a/src/metrics.rs b/src/metrics.rs
index 545c496..94ea791 100644
--- a/src/metrics.rs
+++ b/src/metrics.rs
@@ -1,8 +1,8 @@
/********************************************************************************
* Prometheus exporter for monitoring network connectivity using icmp pings *
* *
- * Copyright (C) 2019-2020 Jan Christian Grünhage *
- * Copyright (C) 2020 Famedly GmbH *
+ * Copyright (C) 2019-2022 Jan Christian Grünhage *
+ * Copyright (C) 2020-2021 Famedly GmbH *
* *
* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU Affero General Public License as *
diff --git a/src/ping.rs b/src/ping.rs
index 946de58..6fd9338 100644
--- a/src/ping.rs
+++ b/src/ping.rs
@@ -1,8 +1,8 @@
/********************************************************************************
* Prometheus exporter for monitoring network connectivity using icmp pings *
* *
- * Copyright (C) 2019-2020 Jan Christian Grünhage *
- * Copyright (C) 2020 Famedly GmbH *
+ * Copyright (C) 2019-2022 Jan Christian Grünhage *
+ * Copyright (C) 2020-2021 Famedly GmbH *
* *
* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU Affero General Public License as *