merge

diff --cc docs/user/quickstart.rst
index 0c89b40,660cdfa..d81ce0f
--- 1/docs/user/quickstart.rst
--- 2/docs/user/quickstart.rst
+++ b/docs/user/quickstart.rst
@@@ -69,8 -69,11 +69,11 @@@ following code:
  You can see that the URL has been correctly encoded by printing the URL::
  
      >>> print r.url
 -    u'http://httpbin.org/get?key2=value2&key1=value1'
 +    http://httpbin.org/get?key2=value2&key1=value1
  
+ Note that any dictionary key whose value is ``None`` will not be added to the
+ URL's query string.
+ 
  
  Response Content
  ----------------