diff --git a/LICENSE b/LICENSE
index 8c11ba1..b447fdf 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,3 +1,5 @@
 To the extent possible under law, Pascal S. de Kloe has waived all
 copyright and related or neighboring rights to part5. This work is
 published from The Netherlands.
+
+https://creativecommons.org/publicdomain/zero/1.0/legalcode