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diff --git a/lib/diameter/src/transport/diameter_transport_sup.erl b/lib/diameter/src/transport/diameter_transport_sup.erl
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+++ b/lib/diameter/src/transport/diameter_transport_sup.erl
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+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2010-2011. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% 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.
+%%
+%% %CopyrightEnd%
+%%
+
+%%
+%% Top supervisor for transport processes.
+%%
+
+-module(diameter_transport_sup).
+
+-behaviour(supervisor).
+
+-export([start_link/0,   %% supervisor start
+         start_child/2]).
+
+%% supervisor callback
+-export([init/1]).
+
+%% ---------------------------------------------------------------------------
+
+%% start_link/0
+%%
+%% Start the transport top supervisor. This is started as a child at
+%% at application start, from diameter_sup.erl. Protocol-specific
+%% supervisors are started as children of this supervisor dynamically
+%% by calling start_child/2. (Eg. diameter_tcp_sup:start/0, which
+%% is called from diameter_tcp:start/3 to start supervisors the
+%% first time a TCP transport process is started.)
+
+start_link() ->
+    SupName = {local, ?MODULE},
+    supervisor:start_link(SupName, ?MODULE, []).
+
+%% start_child/2
+%%
+%% Start a protocol-specific supervisor under the top supervisor.
+
+start_child(Name, Module) ->
+    Spec = {Name,
+            {Module, start_link, [Name]},
+            permanent,
+            1000,
+            supervisor,
+            [Module]},
+    supervisor:start_child(?MODULE, Spec).
+
+%% ---------------------------------------------------------------------------
+
+%% Top supervisor callback.
+init([]) ->
+    Flags   = {one_for_one, 0, 1},
+    Workers = [],  %% Each protocol starts its supervisor on demand.
+    {ok, {Flags, Workers}}.