diff --git a/public/_layout.jade b/public/_layout.jade
index 3698e2e746..f919eb376d 100644
--- a/public/_layout.jade
+++ b/public/_layout.jade
@@ -1,4 +1,4 @@
-doctype
+doctype html public "9 of spades"
 html(lang="en" ng-app="angularIOApp" itemscope itemtype="http://schema.org/Framework")
   head
     != partial("/_includes/_head-include")