[kupfer] plugin_support: Add comment about prefer catalog

[Ulrik Sverdrup <usverdrup src gnome org>]

commit e281aa41184dc0884b3fda314bf40bd40b1fb5a1
Author: Ulrik Sverdrup <ulrik sverdrup gmail com>
Date:   Tue Apr 13 16:28:58 2010 +0200

    plugin_support: Add comment about prefer catalog

 kupfer/plugin_support.py |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/kupfer/plugin_support.py b/kupfer/plugin_support.py
index b8a7480..bb0e847 100644
--- a/kupfer/plugin_support.py
+++ b/kupfer/plugin_support.py
@@ -9,6 +9,9 @@ __all__ = [
 	"check_dbus_connection",
 ]
 
+# NOTE: This setting is a hack and a workaround.
+# A real solution is a catalog configuration pane in preferences.
+# Only use this for plugins with potentially *thousands* of leaves.
 SETTING_PREFER_CATALOG = {
 	"key" : "kupfer_toplevel",
 	"label": _("Include in top level"),