diff --git a/README.md b/README.md
index 2e9b094..0e37446 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ This should be updated fairly regularly. As usual, **pull requests are encourage
 * [Go By Example](https://gobyexample.com/) - Clean, simple, and extensive. These docs that make you want to learn Go just because they make it so straightforward.
 * [gevent API Docs](https://www.gevent.org/intro.html) - Clean, polished docs for gevent. (contributed by [rubik](https://github.com/rubik))
 * [Riemann](https://riemann.io/) - Great design, easy to read, and very thorough with introductory and advanced topics.
-* [Pretty RFC](http://pretty-rfc.herokuapp.com/) - Reworked [IETF](http://www.ietf.org) documents for easier viewing.
+* [Pretty RFC](https://pretty-rfc.herokuapp.com/) - Reworked [IETF](http://www.ietf.org) documents for easier viewing.
 * [Vagrant](https://www.vagrantup.com/docs/) - Well organized, easy to read, attractive design. ([@clstokes](https://twitter.com/clstokes))
 * [Wolfram Language](http://reference.wolfram.com/language/) - Nice top-level navigation in a grid layout. Topics grouped by color, each with a relevant graphic and on-click menu of sub-topics. (contributed by [troytop](http://github.com/troyhop))
 * [Lisp Flavored Erlang: Quick Start](http://lfe.gitbooks.io/quick-start/content/) - Attractive presentation, nice jumpstart for the language. (contributed by [@macintux](https://twitter.com/macintux))