Doc'd HttpResponse.set_cookie()'s secure argument.
@@ -819,6 +819,8 @@ Methods
``domain="example.com"`` will set a cookie that is readable by the
domains www.example.com, blog.example.com, etc. Otherwise, a cookie will
only be readable by the domain that set it.
+ * Use ``secure=True`` if you want the cookie to be only sent to the server
+ when a request is made with the ``https`` scheme.
* Use ``httponly=True`` if you want to prevent client-side
JavaScript from having access to the cookie.
