diff --git a/doc/source/index.rst b/doc/source/index.rst
index 861dbfb374b600b98dc60c168bbfede1de9543bb..95b8ca369e5d6f8f35e5f50803931b65a84418fb 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -4,6 +4,7 @@ Kwant |release| documentation
 
 .. toctree::
    :maxdepth: 2
+   :numbered:
 
    pre/index
    tutorial/index