diff --git a/index.mdwn b/index.mdwn index d027cdd..ad12483 100644 --- a/index.mdwn +++ b/index.mdwn @@ -40,5 +40,6 @@ to see who has contributed to it. #### What Is Copyleft? Here are a few sources to read generally what copyleft is: + * [Richard M. Stallman's essay on copyleft at gnu.org](https://www.gnu.org/copyleft/) * [The Wikipedia entry on Copyleft](http://en.wikipedia.org/wiki/Copyleft)