diff --git a/tracetools_analysis/docs/source/conf.py b/tracetools_analysis/docs/source/conf.py
index ba82879..dcfbdb1 100644
--- a/tracetools_analysis/docs/source/conf.py
+++ b/tracetools_analysis/docs/source/conf.py
@@ -100,7 +100,9 @@ html_theme = 'alabaster'
 # further.  For a list of options available for each theme, see the
 # documentation.
 #
-# html_theme_options = {}
+html_theme_options = {
+    'sidebar_width': '260px',
+}
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,