diff --git a/web/index.html b/web/index.html
index 494bfabfb3d5548fde1018993b0558fc059507b1..c88e6331a4a5f34b13078a2e024ddc8c403bffdc 100644
--- a/web/index.html
+++ b/web/index.html
@@ -1,5 +1,5 @@
<!DOCTYPE html>
-<html>
+<html lang="en">
<head>
<!--
If you are serving your web app in a path other than the root, change the