diff --git a/fullscreen.bs b/fullscreen.bs
index 5661cdf..d8130cc 100644
--- a/fullscreen.bs
+++ b/fullscreen.bs
@@ -12,6 +12,7 @@ Markup Shorthands: css no
 
 <pre class=link-defaults>
 spec:dom
+    type:dfn; for:/; text:document
     type:dfn; for:/; text:element
     type:interface; text:Document
 spec:infra