diff --git a/index.html b/index.html
index f2e849e..d0d2bd2 100644
--- a/index.html
+++ b/index.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="en">
+<html lang="en" prefix="og: https://ogp.me/ns#">
     <head>
         <!-- Copyright *my code only, not the bootstrap parts* under the GNU GPL Licence. Wesley Bryie, 2021.-->
         <meta charset="utf-8" />
