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diff --git a/src/rabbit_authn_backend.erl b/src/rabbit_authn_backend.erl
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+%% The contents of this file are subject to the Mozilla Public License
+%% Version 1.1 (the "License"); you may not use this file except in
+%% compliance with the License. You may obtain a copy of the License
+%% at http://www.mozilla.org/MPL/
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and
+%% limitations under the License.
+%%
+%% The Original Code is RabbitMQ.
+%%
+%% The Initial Developer of the Original Code is GoPivotal, Inc.
+%% Copyright (c) 2007-2014 GoPivotal, Inc.  All rights reserved.
+%%
+
+-module(rabbit_authn_backend).
+
+-include("rabbit.hrl").
+
+-ifdef(use_specs).
+
+%% Check a user can log in, given a username and a proplist of
+%% authentication information (e.g. [{password, Password}]). If your
+%% backend is not to be used for authentication, this should always
+%% refuse access.
+%%
+%% Possible responses:
+%% {ok, User}
+%%     Authentication succeeded, and here's the user record.
+%% {error, Error}
+%%     Something went wrong. Log and die.
+%% {refused, Msg, Args}
+%%     Client failed authentication. Log and die.
+-callback user_login_authentication(rabbit_types:username(), [term()]) ->
+    {'ok', rabbit_types:auth_user()} |
+    {'refused', string(), [any()]} |
+    {'error', any()}.
+
+-else.
+
+-export([behaviour_info/1]).
+
+behaviour_info(callbacks) ->
+    [{user_login_authentication, 2}];
+behaviour_info(_Other) ->
+    undefined.
+
+-endif.