diff -r 2022e4da3ad9 -r 63284c98cdc1 src/pyams_utils/interfaces/tree.py
--- a/src/pyams_utils/interfaces/tree.py	Sat Nov 23 01:24:11 2019 +0100
+++ b/src/pyams_utils/interfaces/tree.py	Sat Nov 23 14:57:24 2019 +0100
@@ -1,7 +1,5 @@
-### -*- coding: utf-8 -*- ####################################################
-##############################################################################
 #
-# Copyright (c) 2012 Thierry Florac <tflorac AT ulthar.net>
+# Copyright (c) 2008-2015 Thierry Florac <tflorac AT ulthar.net>
 # All Rights Reserved.
 #
 # This software is subject to the provisions of the Zope Public License,
@@ -11,7 +9,11 @@
 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
 # FOR A PARTICULAR PURPOSE.
 #
-##############################################################################
+
+"""PyAMS_utils.interfaces.tree module
+
+The interfaces provided by this module are used to manage trees.
+"""
 
 from zope.interface import Interface, Attribute