diff --git a/04-environment/01-overview/page.md b/04-environment/01-overview/page.md
index 38a0f06..baf3502 100644
--- a/04-environment/01-overview/page.md
+++ b/04-environment/01-overview/page.md
@@ -3,7 +3,7 @@ title: Environment Overview
 status: live
 ---
 
-The Slim Framework implements a derivation of the [Rack protocol](http://rack.rubyforge.org/doc/files/SPEC.html). When
+The Slim Framework implements a derivation of the [Rack protocol](http://rack.rubyforge.org/doc/SPEC.html). When
 you instantiate a Slim application, it immediately inspects the `$_SERVER` superglobal and derives a set of environment
 variables that dictate application behavior.