1 files changed, 1 insertions, 0 deletions
diff --git a/404.html b/404.html
index 810c51f..3a215b3 100644
--- a/404.html
+++ b/404.html
@@ -1,5 +1,6 @@
 ---
 ---
+<!DOCTYPE HTML>
 <HTML>
   <HEAD>
   {% include heading.html %}