diff --git a/index.html b/index.html
index 9c15a7ce6..3d52c90e5 100644
--- a/index.html
+++ b/index.html
@@ -6927,7 +6927,7 @@ <h5>Presentational Roles Conflict Resolution</h5>
 				    <li>If <code>aria-valuemin</code> is missing or not a <a href="#valuetype_number">number</a>, it defaults to 0 (zero). </li>
 				    <li>If <code>aria-valuemax</code> is missing or not a <a href="#valuetype_number">number</a>, it defaults to 100. </li>
 				</ul>
-				<p>Authors MUST set the <pref>aria-valuenow</pref> attribute.</p>
+				<p>Authors MUST set the <pref>aria-valuenow</pref> attribute. If aria-valuenow is missing or has an unexpected value, browsers MAY implement the repair techniques specified in the <a href="authorErrorDefaultValuesTable" class="specref">section describing handling author errors in states and properties</a>, which are equivalent to the repair techniques for the <a href="https://www.w3.org/TR/html5/forms.html#range-state-%28type=range%29" title="Range state">HTML range input type</a>.</p>
 				<p>Elements with the role <code>slider</code> have an implicit <pref>aria-orientation</pref> value of <code>horizontal</code>.</p>
 			</div>
 			<table class="role-features">