diff --git a/doc/src/index.rst b/doc/src/index.rst
index 802cabf246c3bba54043977eb0a389078a782722..9fba681430601c3cf5a21919f8d9dcb363c27707 100644
--- a/doc/src/index.rst
+++ b/doc/src/index.rst
@@ -11,7 +11,6 @@ Contents
 --------
 
 .. toctree::
-   :numbered:
    :maxdepth: 2
 
    Introduction