diff --git a/html/app.css b/html/app.css
index 2c2e16ed..d5a74843 100644
--- a/html/app.css
+++ b/html/app.css
@@ -1,6 +1,7 @@
 @charset "utf-8";
 /*
-Copyright(c) 2019 pypy. All rights reserved.
+Copyright(c) 2019-2020 pypy and individual contributors.
+All rights reserved.
 
 This work is licensed under the terms of the MIT license.
 For a copy, see <https://opensource.org/licenses/MIT>.