diff --git a/djangorestframework/status.py b/djangorestframework/status.py
index 684c9b380..f3a5e4814 100644
--- a/djangorestframework/status.py
+++ b/djangorestframework/status.py
@@ -1,8 +1,8 @@
 """
 Descriptive HTTP status codes, for code readability.
 
-See RFC 2616 - Sec 10: http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
-Also see django.core.handlers.wsgi.STATUS_CODE_TEXT
+See RFC 2616 - http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
+And RFC 6585 - http://tools.ietf.org/html/rfc6585
 """
 
 HTTP_100_CONTINUE = 100
@@ -40,9 +40,13 @@ HTTP_414_REQUEST_URI_TOO_LONG = 414
 HTTP_415_UNSUPPORTED_MEDIA_TYPE = 415
 HTTP_416_REQUESTED_RANGE_NOT_SATISFIABLE = 416
 HTTP_417_EXPECTATION_FAILED = 417
+HTTP_428_PRECONDITION_REQUIRED = 428
+HTTP_429_TOO_MANY_REQUESTS = 429
+HTTP_431_REQUEST_HEADER_FIELDS_TOO_LARGE = 431
 HTTP_500_INTERNAL_SERVER_ERROR = 500
 HTTP_501_NOT_IMPLEMENTED = 501
 HTTP_502_BAD_GATEWAY = 502
 HTTP_503_SERVICE_UNAVAILABLE = 503
 HTTP_504_GATEWAY_TIMEOUT = 504
 HTTP_505_HTTP_VERSION_NOT_SUPPORTED = 505
+HTTP_511_NETWORD_AUTHENTICATION_REQUIRED = 511