1 files changed, 1 insertions, 0 deletions
diff --git a/index.html b/index.html
index 8db03b5..0fe9b46 100644
--- a/index.html
+++ b/index.html
@@ -1,3 +1,4 @@
+<!doctype html>
 <html>
   <head>
     <title>L-Systems.JS Playground</title>