diff --git a/IPython/core/interactiveshell.py b/IPython/core/interactiveshell.py
index 13d0639..79a08c9 100644
--- a/IPython/core/interactiveshell.py
+++ b/IPython/core/interactiveshell.py
@@ -97,7 +97,7 @@ try:
             with TemporaryDirectory() as dirname:
                 return {
                     'text/html': sphx.sphinxify(wrapped_docstring, dirname),
-                    'text/plain': docstring
+                    'text/plain': docstring,
                 }
 
         return sphinxify_docstring