diff -r 9b79a4901069 Lib/idlelib/EditorWindow.py
--- a/Lib/idlelib/EditorWindow.py	Sun Sep 20 20:03:01 2015 -0400
+++ b/Lib/idlelib/EditorWindow.py	Sun Sep 20 22:42:09 2015 -0400
@@ -537,16 +535,22 @@
             return 'normal'
 
     def about_dialog(self, event=None):
+        "Handle Help 'About IDLE' event."
+        # Synchronize with macosxSupport.overrideRootMenu.about_dialog.
         aboutDialog.AboutDialog(self.top,'About IDLE')
 
     def config_dialog(self, event=None):
+        "Handle Options 'Configure IDLE' event."
+        # Synchronize with macosxSupport.overrideRootMenu.config_dialog.
         configDialog.ConfigDialog(self.top,'Settings')
+
     def config_extensions_dialog(self, event=None):
+        "Handle Options 'Configure Extensions' event."
         configDialog.ConfigExtensionsDialog(self.top)
 
     def help_dialog(self, event=None):
-        "Handle help doc event."
-        # edit maxosxSupport.overrideRootMenu.help_dialog to match
+        "Handle Help 'IDLE Help' event."
+        # Synchronize with macosxSupport.overrideRootMenu.help_dialog.
         if self.root:
             parent = self.root
         else:
diff -r 9b79a4901069 Lib/idlelib/macosxSupport.py
--- a/Lib/idlelib/macosxSupport.py	Sun Sep 20 20:03:01 2015 -0400
+++ b/Lib/idlelib/macosxSupport.py	Sun Sep 20 22:42:09 2015 -0400
@@ -159,10 +159,14 @@
     WindowList.register_callback(postwindowsmenu)
 
     def about_dialog(event=None):
+        "Handle Help 'About IDLE' event."
+        # Synchronize with EditorWindow.EditorWindow.about_dialog.
         from idlelib import aboutDialog
         aboutDialog.AboutDialog(root, 'About IDLE')
 
     def config_dialog(event=None):
+        "Handle Options 'Configure IDLE' event."
+        # Synchronize with EditorWindow.EditorWindow.config_dialog.
         from idlelib import configDialog
 
         # Ensure that the root object has an instance_dict attribute,
@@ -170,10 +174,11 @@
         # on an EditorWindow instance that is then passed as the first
         # argument to ConfigDialog)
         root.instance_dict = flist.inversedict
-        root.instance_dict = flist.inversedict
         configDialog.ConfigDialog(root, 'Settings')
 
     def help_dialog(event=None):
+        "Handle Help 'IDLE Help' event."
+        # Synchronize with EditorWindow.EditorWindow.help_dialog.
         from idlelib import help
         help.show_idlehelp(root)