diff --git a/doc/config.md b/doc/config.md
index 09b9c26d..e2e56216 100644
--- a/doc/config.md
+++ b/doc/config.md
@@ -2,6 +2,7 @@ Configuration
 =============
 
 * [Introduction](#introduction)
+  * [Environment Variables](#environment-variables)
 * [Service Environment](#service-environment)
 * [Service Wrapper Scripts](#service-wrapper-scripts)
 * [Cgroups](#cgroups)