diff --git a/index.html b/index.html
index 7b0c34a74..ad9ecd497 100644
--- a/index.html
+++ b/index.html
@@ -11731,6 +11731,7 @@ <h4><span class="property-name" title="aria-details" aria-describedby="desc-aria
 				<ul>
 					<li>Comment: <code>aria-details</code> refers to an element with role <a href="#comment" class="role-reference"><code>comment</code></a>.</li>
 					<li>Definition: <code>aria-details</code> is applied to an element with role <a href="#term" class="role-reference"><code>term</code></a> and refers to an element with role <a href="#definition" class="role-reference"><code>definition</code></a>.</li>
+					<li>Caption: <code>aria-details</code> is applied to an element with role <a href="#figure" class="role-reference"><code>figure</code></a> and refers to an element with role <a href="#caption" class="role-reference"><code>caption</code></a>, or an element within a <code>caption</code>.</li>
 					<li>Footnote: <code>aria-details</code> refers to an element with role <code>doc-footnote</code>. This role is defined in [<cite><a class="bibref" data-link-type="biblio" href="#bib-dpub-aria-1.0" title="Digital Publishing WAI-ARIA Module 1.0">DPUB-ARIA-1.0</a></cite>].</li>
 					<li>Endnote: <code>aria-details</code> refers to an element with role <code>doc-endnote</code>. This role is defined in [<cite><a class="bibref" data-link-type="biblio" href="#bib-dpub-aria-1.0" title="Digital Publishing WAI-ARIA Module 1.0">DPUB-ARIA-1.0</a></cite>].</li>
 					<li>Description or general annotation: <code>aria-details</code> refers to an element with any other role.</li>