Issue #25199: Idle: add synchronization comments for future maintainers.
diff --git a/Lib/idlelib/macosxSupport.py b/Lib/idlelib/macosxSupport.py
index 0da46ea..041d700 100644
--- a/Lib/idlelib/macosxSupport.py
+++ b/Lib/idlelib/macosxSupport.py
@@ -161,15 +161,21 @@
     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
         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)