diff --git a/src/main/java/de/jotoho/waituntil/GlobalConf.java b/src/main/java/de/jotoho/waituntil/GlobalConf.java
index bb90dc0..08e8f7a 100644
--- a/src/main/java/de/jotoho/waituntil/GlobalConf.java
+++ b/src/main/java/de/jotoho/waituntil/GlobalConf.java
@@ -1,5 +1,23 @@
 package de.jotoho.waituntil;
 
+/*
+    waituntil - a tool for delaying command execution until the specified time
+    Copyright (C) 2022 Jonas Tobias Hopusch
+
+    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 <https://www.gnu.org/licenses/>.
+*/
+
 import java.util.Locale;
 
 public record GlobalConf() {
diff --git a/src/main/java/de/jotoho/waituntil/Main.java b/src/main/java/de/jotoho/waituntil/Main.java
index 9179c3f..c160fdc 100644
--- a/src/main/java/de/jotoho/waituntil/Main.java
+++ b/src/main/java/de/jotoho/waituntil/Main.java
@@ -1,5 +1,23 @@
 package de.jotoho.waituntil;
 
+/*
+    waituntil - a tool for delaying command execution until the specified time
+    Copyright (C) 2022 Jonas Tobias Hopusch
+
+    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 <https://www.gnu.org/licenses/>.
+*/
+
 import java.util.HashSet;
 import java.util.Map;
 
diff --git a/src/main/java/de/jotoho/waituntil/Sleep.java b/src/main/java/de/jotoho/waituntil/Sleep.java
index 5dde075..9de0947 100644
--- a/src/main/java/de/jotoho/waituntil/Sleep.java
+++ b/src/main/java/de/jotoho/waituntil/Sleep.java
@@ -1,5 +1,23 @@
 package de.jotoho.waituntil;
 
+/*
+    waituntil - a tool for delaying command execution until the specified time
+    Copyright (C) 2022 Jonas Tobias Hopusch
+
+    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 <https://www.gnu.org/licenses/>.
+*/
+
 import java.time.Instant;
 import java.time.ZonedDateTime;
 import java.time.format.DateTimeFormatter;
diff --git a/src/main/java/de/jotoho/waituntil/TimeCalculator.java b/src/main/java/de/jotoho/waituntil/TimeCalculator.java
index 34ec750..5da115f 100644
--- a/src/main/java/de/jotoho/waituntil/TimeCalculator.java
+++ b/src/main/java/de/jotoho/waituntil/TimeCalculator.java
@@ -1,5 +1,23 @@
 package de.jotoho.waituntil;
 
+/*
+    waituntil - a tool for delaying command execution until the specified time
+    Copyright (C) 2022 Jonas Tobias Hopusch
+
+    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 <https://www.gnu.org/licenses/>.
+*/
+
 import java.time.Instant;
 import java.time.LocalDate;
 import java.time.LocalTime;