diff --git a/LICENSE.txt b/LICENSE
similarity index 100%
rename from LICENSE.txt
rename to LICENSE
diff --git a/README.md b/README.md
index 4b052d0..de4968a 100644
--- a/README.md
+++ b/README.md
@@ -36,3 +36,13 @@ that, the easiest way is to override the entrypoint or to mount somewhere else
 and create a symbolic link. For details on that see the `Dockerfile` and
 `entrypoint.sh`.
 
+## License
+
+This work is licensed under a
+[Creative Commons Attribution-ShareAlike 4.0 International License][cc-by-sa].
+
+[![CC BY-SA 4.0][cc-by-sa-image]][cc-by-sa]
+
+[cc-by-sa]: http://creativecommons.org/licenses/by-sa/4.0/
+[cc-by-sa-image]: https://licensebuttons.net/l/by-sa/4.0/88x31.png
+[cc-by-sa-shield]: https://img.shields.io/badge/License-CC%20BY--SA%204.0-lightgrey.svg