diff --git a/README.md b/README.md
index ad7b518..cdfc07e 100644
--- a/README.md
+++ b/README.md
@@ -2,3 +2,6 @@ quartz
 ======
 
 A mod that adds quartz to minetest.
+
+This mod is licensed under a CC BY-SA 3.0 license.  
+http://creativecommons.org/licenses/by-sa/3.0/