--- a/src/pyams_utils/fanstatic.py	Mon Jun 19 15:45:39 2017 +0200
+++ b/src/pyams_utils/fanstatic.py	Mon Jun 19 15:54:58 2017 +0200
@@ -9,7 +9,6 @@
 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
 # FOR A PARTICULAR PURPOSE.
 #
-from pyramid.path import DottedNameResolver
 
 __docformat__ = 'restructuredtext'
 
@@ -23,6 +22,7 @@
 from fanstatic import Resource
 from fanstatic.core import set_resource_file_existence_checking, render_css, NeededResources
 from pyams_utils.adapter import adapter_config, ContextRequestViewAdapter
+from pyramid.path import DottedNameResolver
 from zope.interface import Interface
 
 
@@ -62,7 +62,17 @@
 
 @adapter_config(name='resource_path', context=(Interface, Interface, Interface), provides=ITALESExtension)
 class FanstaticTalesExtension(ContextRequestViewAdapter):
-    """extension:fanstatic() TALES extension"""
+    """extension:resource_path() TALES extension
+
+    This TALES extension generates an URL matching a given Fanstatic resource.
+    Resource is given as a string made of package name (in dotted form) followed by a colon and by the resource name.
+
+    For example::
+
+    .. code-block:: html
+
+        <div tal:attributes="data-ams-plugin-pyams_content-src extension:resource_path('pyams_content.skin:pyams_content')" />
+    """
 
     def render(self, resource):
         library, resource_name = resource.split(':')