diff --git a/AUTHORS.md b/AUTHORS.md
new file mode 100644
index 0000000..7b13b98
--- /dev/null
+++ b/AUTHORS.md
@@ -0,0 +1,16 @@
+# waituntil Contributors / Authors
+
+By adding their names to this document, contributors agree to license all of their
+contributions and patches to the waituntil project [under the AGPL version 3 or later.](./LICENSE.md)
+
+Contributors may choose to supply either their complete legal name, online pseudonym or both.
+At least one is required.
+
+The email, website and notes fields are optional but contributors are encouraged
+to supply at least one reliable method of communication.
+
+## Maintainer(s)
+
+| full name | pseudonym | email | website | notes |
+|-|:-:|-:|-:|-|
+| Jonas Tobias Hopusch | jotoho | [contact@jotoho.de](mailto:contact@jotoho.de) | [www.jotoho.de](https://www.jotoho.de/) | original creator |
diff --git a/README.md b/README.md
index fdf8128..0b4c1b2 100644
--- a/README.md
+++ b/README.md
@@ -14,11 +14,25 @@ the next command to run. The timestamp can be passed in the formats `HH:MM` or `
 be in the 24-hour system. Passing dates is not supported but entering a time that has already passed
 will make the software wait until that time on the following day.
 
+## Contributing / Submitting Feedback
+
+The [canonical home of this project](https://gitea.jotoho.de/jotoho/waituntil/) is 
+[on my personal Gitea-instance](https://gitea.jotoho.de/) but since it has registration
+turned off, collaborating there is difficult.
+
+If you have not been given an account on [gitea.jotoho.de](https://gitea.jotoho.de/)
+then you can alternatively send me feedback, bug reports or patches [via email to
+contact@jotoho.de](mailto:contact@jotoho.de).
+Should that fail, there may be alternative ways to contact me listed on
+[my personal website.](https://www.jotoho.de/)
+
+In the future, I may also decide to create a mirror for this project on GitHub, gitlab.com or similar.
+
 ## Copyright / Licensing
 
 ```
 waituntil - a tool for delaying command execution until the specified time
-Copyright (C) 2021 Jonas Tobias Hopusch
+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
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;