diff --git a/doc/source/developer-docs/extending.rst b/doc/source/developer-docs/extending.rst
index b42b988308..6b706f2a3a 100644
--- a/doc/source/developer-docs/extending.rst
+++ b/doc/source/developer-docs/extending.rst
@@ -80,7 +80,7 @@ deployed environment, allowing a deployer to define additional group mappings.
 This directory is used to extend the environment skeleton, or modify the
 defaults defined in the ``playbooks/inventory/env.d`` directory.
 
-See also `Understanding Container Groups`_ in Appendix H.
+See also `Understanding Container Groups`_ in Appendix C.
 
 .. _Understanding Container Groups: ../install-guide/app-custom-layouts.html#understanding-container-groups
 
@@ -94,7 +94,7 @@ OpenStack-Ansible in the
 Additional services should be defined with a YAML file in
 ``/etc/openstack_deploy/conf.d``, in order to manage file size.
 
-See also `Understanding Host Groups`_ in Appendix H.
+See also `Understanding Host Groups`_ in Appendix C.
 
 .. _Understanding Host Groups: ../install-guide/app-custom-layouts.html#understanding-host-groups