diff --git a/Lib/idlelib/EditorWindow.py b/Lib/idlelib/EditorWindow.py
index 09f2b28657d..0c4caa0b9c2 100644
--- a/Lib/idlelib/EditorWindow.py
+++ b/Lib/idlelib/EditorWindow.py
@@ -537,16 +537,22 @@ class EditorWindow(object):
             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 --git a/Lib/idlelib/macosxSupport.py b/Lib/idlelib/macosxSupport.py
index 1030afea5f3..b96bae1d550 100644
--- a/Lib/idlelib/macosxSupport.py
+++ b/Lib/idlelib/macosxSupport.py
@@ -159,10 +159,14 @@ def overrideRootMenu(root, flist):
     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 @@ def overrideRootMenu(root, flist):
         # 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)