diff --git a/tui.lua b/tui.lua
index 7a80b6c..e339656 100644
--- a/tui.lua
+++ b/tui.lua
@@ -1,3 +1,28 @@
+--!A cross-platform terminal ui library based on Lua
+--
+-- Licensed to the Apache Software Foundation (ASF) under one
+-- or more contributor license agreements.  See the NOTICE file
+-- distributed with this work for additional information
+-- regarding copyright ownership.  The ASF licenses this file
+-- 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.
+--
+-- Copyright (C) 2015-2020, TBOOX Open Source Group.
+--
+-- @author      ruki
+-- @file        inputdialog.lua
+--
+-- require("tests/load")
+
 --  requires
 local ltui        = require("ltui")
 local label       = ltui.label