diff --git a/docs/index.rst b/docs/index.rst
index fc9304ef..38ed3f55 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -58,7 +58,7 @@ Get started
 * API (advanced): :ref:`api`.
 
 .. toctree::
-   :maxdepth: 1
+   :maxdepth: 4
    :caption: Contents:
 
    intro.rst