diff --git a/src/machi_csum_table.erl b/src/machi_csum_table.erl
index cc4dd08..ae6cd3a 100644
--- a/src/machi_csum_table.erl
+++ b/src/machi_csum_table.erl
@@ -1,3 +1,23 @@
+%% -------------------------------------------------------------------
+%%
+%% Copyright (c) 2007-2016 Basho Technologies, Inc.  All Rights Reserved.
+%%
+%% This file is provided to you under the Apache License,
+%% Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing,
+%% software distributed under the License is distributed on an
+%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+%% KIND, either express or implied.  See the License for the
+%% specific language governing permissions and limitations
+%% under the License.
+%%
+%% -------------------------------------------------------------------
+
 -module(machi_csum_table).
 
 -export([open/2,
diff --git a/src/machi_plist.erl b/src/machi_plist.erl
index 7750b0a..a1988f0 100644
--- a/src/machi_plist.erl
+++ b/src/machi_plist.erl
@@ -1,3 +1,23 @@
+%% -------------------------------------------------------------------
+%%
+%% Copyright (c) 2007-2016 Basho Technologies, Inc.  All Rights Reserved.
+%%
+%% This file is provided to you under the Apache License,
+%% Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing,
+%% software distributed under the License is distributed on an
+%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+%% KIND, either express or implied.  See the License for the
+%% specific language governing permissions and limitations
+%% under the License.
+%%
+%% -------------------------------------------------------------------
+
 -module(machi_plist).
 
 %%% @doc persistent list of binaries