diff --git a/source b/source
index 8dc1343bcad..ed0bc5ba5a9 100644
--- a/source
+++ b/source
@@ -42790,8 +42790,8 @@ interface <dfn interface>HTMLTableSectionElement</dfn> : <span>HTMLElement</span
 
   <p>The <code>thead</code> element <span>represents</span> the <span
   data-x="concept-row-group">block</span> of <span data-x="concept-row">rows</span> that consist of
-  the column labels (headers) for the parent <code>table</code> element, if the <code>thead</code>
-  element has a parent and it is a <code>table</code>.</p>
+  the column labels (headers) and any ancillary non-header cells for the parent <code>table</code>
+  element, if the <code>thead</code> element has a parent and it is a <code>table</code>.</p>
 
   <div w-nodev>