diff --git a/inttest/port/port_rt.erl b/inttest/port/port_rt.erl
index 34324da..90ecbdc 100644
--- a/inttest/port/port_rt.erl
+++ b/inttest/port/port_rt.erl
@@ -1,5 +1,29 @@
 %% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
 %% ex: ts=4 sw=4 et
+%% -------------------------------------------------------------------
+%%
+%% rebar: Erlang Build Tools
+%%
+%% Copyright (c) 2014 Tomas Janousek
+%%
+%% Permission is hereby granted, free of charge, to any person obtaining a copy
+%% of this software and associated documentation files (the "Software"), to deal
+%% in the Software without restriction, including without limitation the rights
+%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+%% copies of the Software, and to permit persons to whom the Software is
+%% furnished to do so, subject to the following conditions:
+%%
+%% The above copyright notice and this permission notice shall be included in
+%% all copies or substantial portions of the Software.
+%%
+%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+%% THE SOFTWARE.
+%% -------------------------------------------------------------------
 
 -module(port_rt).
 -export([files/0,
@@ -16,15 +40,15 @@ files() ->
     ].
 
 run(_Dir) ->
-    % wait a bit for new files to have different timestamps
+    %% wait a bit for new files to have different timestamps
     wait(),
-    % test.so is created during first compile
+    %% test.so is created during first compile
     ?assertEqual(0, filelib:last_modified("priv/test.so")),
     ?assertMatch({ok, _}, retest_sh:run("./rebar compile", [])),
     TestSo1 = filelib:last_modified("priv/test.so"),
     ?assert(TestSo1 > 0),
     wait(),
-    % nothing happens during second compile
+    %% nothing happens during second compile
     ?assertMatch({ok, _}, retest_sh:run("./rebar compile", [])),
     TestSo2 = filelib:last_modified("priv/test.so"),
     Test1o2 = filelib:last_modified("c_src/test1.o"),
@@ -33,7 +57,7 @@ run(_Dir) ->
     ?assert(TestSo1 >= Test1o2),
     ?assert(TestSo1 >= Test2o2),
     wait(),
-    % when test2.c changes, at least test2.o and test.so are rebuilt
+    %% when test2.c changes, at least test2.o and test.so are rebuilt
     ?assertMatch({ok, _}, retest_sh:run("touch c_src/test2.c", [])),
     ?assertMatch({ok, _}, retest_sh:run("./rebar compile", [])),
     TestSo3 = filelib:last_modified("priv/test.so"),
@@ -41,7 +65,7 @@ run(_Dir) ->
     ?assert(TestSo3 > TestSo2),
     ?assert(Test2o3 > TestSo2),
     wait(),
-    % when test2.h changes, at least test2.o and test.so are rebuilt
+    %% when test2.h changes, at least test2.o and test.so are rebuilt
     ?assertMatch({ok, _}, retest_sh:run("touch c_src/test2.h", [])),
     ?assertMatch({ok, _}, retest_sh:run("./rebar compile", [])),
     TestSo4 = filelib:last_modified("priv/test.so"),
@@ -49,7 +73,7 @@ run(_Dir) ->
     ?assert(TestSo4 > TestSo3),
     ?assert(Test2o4 > TestSo3),
     wait(),
-    % when test1.h changes, everything is rebuilt
+    %% when test1.h changes, everything is rebuilt
     ?assertMatch({ok, _}, retest_sh:run("touch c_src/test1.h", [])),
     ?assertMatch({ok, _}, retest_sh:run("./rebar compile", [])),
     TestSo5 = filelib:last_modified("priv/test.so"),