Add new option to README.txt and removed an unecessary check in _get_available_username()

README.txt

@@ -125,3 +125,14 @@ If you require openid authentication into the admin application, add the followi
 It is worth noting that a user needs to be be marked as a "staff user" to be able to access the admin interface.  A new openid user will not normally be a "staff user".  
 The easiest way to resolve this is to use traditional authentication (OPENID_USE_AS_ADMIN_LOGIN = False) to sign in as your first user with a password and authorise your 
 openid user to be staff.
+
+== Change Django usernames if the nickname changes on the provider ==
+
+If you want your Django username to change when a user updates the nickname on their provider, add the following setting:
+
+        OPENID_FOLLOW_RENAMES = True
+
+If the new nickname is available as a Django username, the user is renamed.
+Otherwise the user will be renamed to nickname+i for an incrememnting value of i until no conflict occurs.
+If the user has already been renamed to nickname+1 due to a conflict, and the nickname is still not available, the user will keep their existing username.
+

django_openid_auth/auth.py

@@ -176,10 +176,6 @@ class OpenIDBackend:
                 username += str(i)
             try:
                 user = User.objects.get(username__exact=username)
-                if user.useropenid_set.filter(claimed_id__exact=identity_url).count() > 0:
-                    # username already belongs to this openid user, so it's okay
-                    return username
-                    
             except User.DoesNotExist:
                 break
             i += 1