diff --git a/usps/usps.py b/usps/usps.py
index 0de3eef..bbdec3f 100644
--- a/usps/usps.py
+++ b/usps/usps.py
@@ -51,8 +51,9 @@ def create_label(self, *args, **kwargs):
 
 class AddressValidate(object):
 
-    def __init__(self, usps, address):
+    def __init__(self, usps, address, revision=False):
         xml = etree.Element('AddressValidateRequest', {'USERID': usps.api_user_id})
+        entree.SubElement(xml, "Revision").text = str(int(revision))
         _address = etree.SubElement(xml, 'Address', {'ID': '0'})
         address.add_to_xml(_address, prefix='', validate=True)