--- a/src/pyams_utils/interfaces/traversing.py	Sat Nov 23 01:24:11 2019 +0100
+++ b/src/pyams_utils/interfaces/traversing.py	Sat Nov 23 14:57:24 2019 +0100
@@ -10,16 +10,18 @@
 # FOR A PARTICULAR PURPOSE.
 #
 
-__docformat__ = 'restructuredtext'
+"""PyAMS_utils.interfaces.traversing module
+
+The IPathElements is used by an Hypatia index to store internal IDs of parents of a given
+objects; this allows to query catalog for objects which are located "inside" a given parent
+object, identified by it's internal ID.
+"""
+
+from zope.interface import Interface
+from zope.schema import Int, List
 
 
-# import standard library
-
-# import interfaces
-
-# import packages
-from zope.interface import Interface
-from zope.schema import List, Int
+__docformat__ = 'restructuredtext'
 
 
 class IPathElements(Interface):