diff --git a/readme.md b/readme.md
index 7cda507..a8f8c7a 100644
--- a/readme.md
+++ b/readme.md
@@ -9,3 +9,7 @@ I did some fit tests and found that 0.2 mm clearance (as measured after print) w
 Calculations were done in fit-calculations.ods
 
 This was modelled with https://dune3d.org/
+
+# License
+
+This repository is licensed under CC-BY-SA-4.0: https://creativecommons.org/licenses/by-sa/4.0/