diff --git a/django/core/handlers/wsgi.py b/django/core/handlers/wsgi.py
index af78d1d2695..38d8154ac98 100644
--- a/django/core/handlers/wsgi.py
+++ b/django/core/handlers/wsgi.py
@@ -103,6 +103,7 @@ class WSGIRequest(http.HttpRequest):
             content_length = 0
         self._stream = LimitedStream(self.environ['wsgi.input'], content_length)
         self._read_started = False
+        self.resolver_match = None
 
     def _is_secure(self):
         return 'wsgi.url_scheme' in self.environ and self.environ['wsgi.url_scheme'] == 'https'
diff --git a/django/http/request.py b/django/http/request.py
index 37aa1a355a6..b7f9d241a7f 100644
--- a/django/http/request.py
+++ b/django/http/request.py
@@ -39,6 +39,10 @@ class HttpRequest(object):
     _upload_handlers = []
 
     def __init__(self):
+        # WARNING: The `WSGIRequest` subclass doesn't call `super`.
+        # Any variable assignment made here should also happen in
+        # `WSGIRequest.__init__()`.
+
         self.GET, self.POST, self.COOKIES, self.META, self.FILES = {}, {}, {}, {}, {}
         self.path = ''
         self.path_info = ''