diff --git a/index.html b/index.html
index 0ef0762..145a989 100644
--- a/index.html
+++ b/index.html
@@ -847,6 +847,10 @@ <h2>
         |document|, the user agent MUST run the following steps:
       </p>
       <ol class="algorithm">
+        <li>If |document|'s {{Document/[[orientationPendingPromise]]}} is not
+        `null`, [=reject and nullify the current lock promise=] of |document|
+        with an {{"AbortError"}}.
+        </li>
         <li>If |document| is not a [=top-level traversable=]'s
         [=navigable/active document=], abort these steps.
         </li>