diff --git a/daphne/access.py b/daphne/access.py
index a3508ea..9bd1489 100644
--- a/daphne/access.py
+++ b/daphne/access.py
@@ -21,6 +21,7 @@ class AccessLogGenerator(object):
                 date=datetime.datetime.now(),
                 request="%(method)s %(path)s" % details,
                 status=details['status'],
+                length=details['size'],
             )
         # Websocket requests
         elif protocol == "websocket" and action == "connected":
diff --git a/daphne/http_protocol.py b/daphne/http_protocol.py
index 138aea1..0c47d66 100755
--- a/daphne/http_protocol.py
+++ b/daphne/http_protocol.py
@@ -176,6 +176,7 @@ class WebRequest(http.Request):
                 "method": self.method.decode("ascii"),
                 "client": "%s:%s" % (self.client.host, self.client.port),
                 "time_taken": self.duration(),
+                "size": self.sentLength,
             })
         else:
             logger.debug("HTTP response chunk for %s", self.reply_channel)