diff --git a/slides/index.md b/slides/index.md
index c155343f15abd089109483b1adc9700d691389be..b514e480c80537c67d35a48cc80ade2b8e04caad 100644
--- a/slides/index.md
+++ b/slides/index.md
@@ -6,9 +6,9 @@ subtitle: Overview
 **Introduction**
 
 * [Introduction to DuMu^x^](./intro.html)
-* [Part I](#section-1) Building DuMu^x^, configure and run applications
-* [Part II](#section-2) Customization, working with the code
-* [Part III](#section-3) Advanced exercises, multidomain models
+* [Part I](#section) Building DuMu^x^, configure and run applications
+* [Part II](#section-1) Customization, working with the code
+* [Part III](#section-2) Advanced exercises, multidomain models
 
 ##