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diff --git a/index.html b/index.html
index bd6d76e..c5d08cd 100644
--- a/index.html
+++ b/index.html
@@ -1,5 +1,6 @@
 <title>Marc's Programming Notes</title>
 <!-- generated by build.sh. DO NOT EDIT. -->
+<!DOCTYPE html>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <style>