diff --git a/text-mode.html b/text-mode.html
index 4b7fe2a..78ac333 100644
--- a/text-mode.html
+++ b/text-mode.html
@@ -1,4 +1,19 @@
 <!doctype html>
+<!--
+   Copyright 2020 wixette@gmail.com
+
+   Licensed 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.
+-->
 <html>
   <head>
     <meta charset="utf-8">
