diff --git a/plotly/offline/offline.py b/plotly/offline/offline.py
index 145e0a9fce..44e75b53ce 100644
--- a/plotly/offline/offline.py
+++ b/plotly/offline/offline.py
@@ -179,12 +179,12 @@ def _plot_html(figure_or_data, config, validate, default_width,
                               cls=utils.PlotlyJSONEncoder)
 
     configkeys = (
-        'staticPlot'
+        'staticPlot',
         'plotlyServerURL',
         'editable',
         'edits',
         'autosizable',
-        'queueLength'
+        'queueLength',
         'fillFrame',
         'frameMargins',
         'scrollZoom',
@@ -204,10 +204,10 @@ def _plot_html(figure_or_data, config, validate, default_width,
         'displaylogo',
         'plotGlPixelRatio',
         'setBackground',
-        'topojsonURL'
+        'topojsonURL',
         'mapboxAccessToken',
         'logging',
-        'globalTransforms'
+        'globalTransforms',
         'locale',
         'locales',
     )