diff --git a/doc/contributing/source/index.rst b/doc/contributing/source/index.rst
index 7604e4194..798857449 100644
--- a/doc/contributing/source/index.rst
+++ b/doc/contributing/source/index.rst
@@ -24,6 +24,7 @@ This document is written in `reStructuredText <http://docutils.sourceforge.net/r
 
 .. toctree::
    :maxdepth: 2
+   :numbered:
 
    introduction
    general
diff --git a/doc/installation/source/index.rst b/doc/installation/source/index.rst
index cbc5d8623..a11a97ada 100644
--- a/doc/installation/source/index.rst
+++ b/doc/installation/source/index.rst
@@ -24,6 +24,7 @@ for `Sphinx <http://sphinx.pocoo.org/>`_ and is maintained in the ``doc/installa
 
 .. toctree::
    :maxdepth: 2
+   :numbered:
 
    overview
    quick-start
diff --git a/doc/manual/source/index.rst b/doc/manual/source/index.rst
index 534153633..f2bf761da 100644
--- a/doc/manual/source/index.rst
+++ b/doc/manual/source/index.rst
@@ -24,6 +24,7 @@ This document is written in `reStructuredText <http://docutils.sourceforge.net/r
 
 .. toctree::
    :maxdepth: 2
+   :numbered:
 
    organization
    simulator
diff --git a/doc/models/source/index.rst b/doc/models/source/index.rst
index 382f7b9ca..205b92d40 100644
--- a/doc/models/source/index.rst
+++ b/doc/models/source/index.rst
@@ -25,6 +25,7 @@ from the ``doc/`` directory of each module.  Source file column width is 100 col
 
 .. toctree::
    :maxdepth: 1
+   :numbered:
 
    organization
    animation
diff --git a/doc/tutorial/source/index.rst b/doc/tutorial/source/index.rst
index 042b1efd0..8af2593b1 100644
--- a/doc/tutorial/source/index.rst
+++ b/doc/tutorial/source/index.rst
@@ -24,6 +24,7 @@ This document is written in `reStructuredText <http://docutils.sourceforge.net/r
 
 .. toctree::
    :maxdepth: 2
+   :numbered:
 
    quick-start
    introduction