diff --git a/README.md b/README.md
index 92f5633..2a3f46e 100644
--- a/README.md
+++ b/README.md
@@ -91,3 +91,9 @@ Tested on:
 Requires [Standardese](https://github.com/foonathan/standardese) for generating documentation.
 
 Requires [Catch](https://github.com/philsquared/Catch) for testing. This is bundled in the test directory.
+
+----------
+
+[![CC0](http://i.creativecommons.org/p/zero/1.0/88x31.png)]("http://creativecommons.org/publicdomain/zero/1.0/")
+
+To the extent possible under law, [Simon Brand](https://twitter.com/TartanLlama) has waived all copyright and related or neighboring rights to the `optional` library. This work is published from: United Kingdom.