diff --git a/index.html b/index.html
index 2228e09..ce280db 100644
--- a/index.html
+++ b/index.html
@@ -680,8 +680,8 @@ <h2>
           |exceptionName|, the [=user agent=] MUST:
         </p>
         <ol class="algorithm" data-tests="orientation-locking.html">
-          <li>If |document|'s {{Document/[[orientationPendingPromise]]}} is
-          `null`, abort these steps.
+          <li>[=/Assert=]: {{Document/[[orientationPendingPromise]]}} is not
+          `null`.
           </li>
           <li>Let |promise:Promise| be |document|'s
           {{Document/[[orientationPendingPromise]]}}.
@@ -705,8 +705,9 @@ <h2>
       </p>
       <ol>
         <li>If |document| stops being [=Document/fully active=] while [=in
-        parallel=], [=reject and nullify the current lock promise=] of
-        |document| with an {{"AbortError"}}.
+        parallel=], and {{Document/[[orientationPendingPromise]]}} is not
+        `null`, [=reject and nullify the current lock promise=] of |document|
+        with an {{"AbortError"}}.
         </li>
         <li>Let |topDocument| be |document|'s [=top-level browsing context=]'s
         [=active document=].