diff --git a/index.html b/index.html
index 72ac67104debd073f4fc43c1375149c0b35a3d15..6b21cca3c66b6d3217240b50d1c5746fdd479eb5 100644
--- a/index.html
+++ b/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />