If you don't mind, I added a link to RFC 2119, on the text “RFC 2119”. Less Googling == #win.
Added link to IETF-hosted RFC 2119 spec.
Went with the hosted version of RFC 2119 that Wikipedia links to. It's not terribly pretty, but it works.
Merge pull request #21 from slippyd/master
Linking to RFC 2119
Thanks for the pull request!