diff --git a/doc/source/conf.py b/doc/source/conf.py
index 1bbb962f..2a41a1af 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -36,6 +36,7 @@ sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__),
 # extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
 extensions = ['sphinx.ext.autodoc',
+              'sphinx.ext.todo',
               'sphinx.ext.coverage',
               'sphinx.ext.intersphinx',
               'openstackdocstheme',
@@ -233,4 +234,4 @@ intersphinx_mapping = {
 # -- Options for openstackdocstheme -------------------------------------------
 repository_name = 'openstack/keystoneauth'
 bug_project = 'keystoneauth'
-bug_tag = 'doc'
\ No newline at end of file
+bug_tag = 'doc'