diff --git a/doc/source/index.rst b/doc/source/index.rst
index 95b8ca369e5d6f8f35e5f50803931b65a84418fb..40aa546aca41ad63d29a18f2e1d9d3f1fc53cf7e 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -4,7 +4,7 @@ Kwant |release| documentation
 
 .. toctree::
    :maxdepth: 2
-   :numbered:
+   :numbered: 3
 
    pre/index
    tutorial/index