diff --git a/README.md b/README.md
index 53d70f1..d8d9f90 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,12 @@
-# git-diff-image
-An extension to 'git diff' that provides support for diffing images
+git-diff-image
+==============
+
+This is an extension to 'git diff' that provides support for diffing images.
+
+Public domain dedication
+------------------------
+
+The files in this repository are by Ewan Mellor, and are dedicated
+to the public domain. To the extent possible under law, Ewan Mellor
+has waived all copyright and related or neighboring rights to this
+work. http://creativecommons.org/publicdomain/zero/1.0/.