diff --git a/examples/basic.html b/examples/basic.html
index 23570c0..5ddd31f 100644
--- a/examples/basic.html
+++ b/examples/basic.html
@@ -1,4 +1,20 @@
 <!DOCTYPE html>
+<!--
+ Copyright 2020 Google LLC
+
+ 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 http-equiv="content-type" content="text/html; charset=utf-8" />
diff --git a/examples/events.html b/examples/events.html
index f9f0b9c..b6ddf19 100644
--- a/examples/events.html
+++ b/examples/events.html
@@ -1,4 +1,20 @@
 <!DOCTYPE html>
+<!--
+ Copyright 2020 Google LLC
+
+ 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 http-equiv="content-type" content="text/html; charset=utf-8" />
diff --git a/examples/lettered.html b/examples/lettered.html
index 93a8276..6a32aca 100644
--- a/examples/lettered.html
+++ b/examples/lettered.html
@@ -1,4 +1,20 @@
 <!DOCTYPE html>
+<!--
+ Copyright 2020 Google LLC
+
+ 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 http-equiv="content-type" content="text/html; charset=utf-8" />
diff --git a/examples/picturelabel.html b/examples/picturelabel.html
index f8fdad8..e030bb1 100644
--- a/examples/picturelabel.html
+++ b/examples/picturelabel.html
@@ -1,4 +1,20 @@
 <!DOCTYPE html>
+<!--
+ Copyright 2020 Google LLC
+
+ 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 http-equiv="content-type" content="text/html; charset=utf-8" />
