diff --git a/README.md b/README.md
index 7a674da..7cfe123 100644
--- a/README.md
+++ b/README.md
@@ -216,4 +216,6 @@ $sidebar.html("instead");
 
 * [When maps shouldn't be maps](http://www.ericson.net/content/2011/10/when-maps-shouldnt-be-maps/)
 
-* [Shawn Allen's web how-to](https://github.com/shawnbot/web-howto/wiki)
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+* [Shawn Allen's web how-to](https://github.com/shawnbot/web-howto/wiki)
+
+* [The Twelve-Factor App](http://12factor.net)
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