Merge pull request #165 from pycrusher/improvement

Add explanation for argument 'base_url'

Author: kmike

parsel/selector.py

@@ -172,6 +172,9 @@ class Selector(object):
 
     ``type`` defines the selector type, it can be ``"html"``, ``"xml"`` or ``None`` (default).
     If ``type`` is ``None``, the selector defaults to ``"html"``.
+
+    ``base_url`` allows setting a URL for the document. This is needed when looking up external entities with relative paths.
+    See [`lxml` documentation](https://lxml.de/api/index.html) ``lxml.etree.fromstring`` for more information.
     """
 
     __slots__ = ['text', 'namespaces', 'type', '_expr', 'root',