diff --git a/dom.bs b/dom.bs
index f472a3b3c..e36c26e13 100644
--- a/dom.bs
+++ b/dom.bs
@@ -2254,6 +2254,10 @@ can be used to explore this matter in more detail.
  {{ProcessingInstruction}}, or {{Comment}}.
 
  <p>Objects that implement {{Text}} sometimes implement {{CDATASection}}.
+
+ <p>Thus, every [=node=]'s [=primary interface=] is one of: {{Document}}, {{DocumentType}},
+ {{DocumentFragment}}, {{ShadowRoot}}, {{Element}} or an inherited interface of {{Element}},
+ {{Attr}}, {{Text}}, {{CDATASection}}, {{ProcessingInstruction}}, or {{Comment}}.
 </div>
 
 <p>For brevity, this specification refers to an object that <a>implements</a> {{Node}} and an