diff --git a/doc/upstream-training/conf.py b/doc/upstream-training/conf.py
index 16ba4c27..c971e3de 100644
--- a/doc/upstream-training/conf.py
+++ b/doc/upstream-training/conf.py
@@ -120,7 +120,9 @@ html_theme = 'openstackdocs'
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
-# html_theme_options = {}
+html_theme_options = {
+    'sidebar_mode': 'toc',
+}
 
 # Add any paths that contain custom themes here, relative to this directory.
 html_theme_path = [openstackdocstheme.get_html_theme_path()]