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-rw-r--r--railties/guides/source/layout.html.erb3
1 files changed, 3 insertions, 0 deletions
diff --git a/railties/guides/source/layout.html.erb b/railties/guides/source/layout.html.erb
index a21f1bbeed..cb9fb417fc 100644
--- a/railties/guides/source/layout.html.erb
+++ b/railties/guides/source/layout.html.erb
@@ -1,3 +1,6 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>