diff --git a/dom.bs b/dom.bs
index 75f117ff..2f556baa 100644
--- a/dom.bs
+++ b/dom.bs
@@ -2663,8 +2663,8 @@ of a <var>node</var> into a <var>parent</var> before a <var>child</var>, run the
  <var>node</var>'s <a for=/>shadow-including root</a>, then <a>throw</a> a
  "{{HierarchyRequestError!!exception}}" {{DOMException}}.</p></li>
 
- <li><p>If <var>parent</var> is not an {{Element}} <a for=/>node</a>, then <a>throw</a> a
- "{{HierarchyRequestError!!exception}}" {{DOMException}}.
+ <li><p>If <var>parent</var> is not an {{Element}} or {{DocumentFragment}} <a for=/>node</a>, then
+ <a>throw</a> a "{{HierarchyRequestError!!exception}}" {{DOMException}}.
 
  <li><p>If <var>node</var> is a <a>host-including inclusive ancestor</a> of <var>parent</var>, then
  <a>throw</a> a "{{HierarchyRequestError!!exception}}" {{DOMException}}.