diff --git a/source b/source
index 6778885a97e..0c8ec3c6627 100644
--- a/source
+++ b/source
@@ -8086,6 +8086,17 @@ interface <dfn>DOMStringList</dfn> {
       <ol>
        <li><p>Let <var>agentCluster</var> be the <span>surrounding agent</span>'s
        <span>agent cluster</span>.</p></li>
+       <li>
+        <p>If <var>agentCluster</var>'s <span
+        data-x="concept-settings-object-cross-origin-isolated-capability">cross-origin isolated
+        capability</span> is false, then throw a
+        <span>"<code>DataCloneError</code>"</span><code>DOMException</code>.</p>
+
+        <p class="note">This check is only needed when serializing (and not when deserializing) as
+        <var data-x="concept-settings-object-cross-origin-isolated-capability">cross-origin isolated
+        </var> cannot change over time and a <code>SharedArrayBuffer</code> cannot leave an
+        <span>agent cluster</span>.</p>
+       </li>
 
        <li><p>If <var>forStorage</var> is true, then throw a
        <span>"<code>DataCloneError</code>"</span> <code>DOMException</code>.</p></li>
@@ -8503,18 +8514,6 @@ o.myself = o;</code></pre>
      <var>serialized</var>.[[AgentCluster]], then then throw a
      <span>"<code>DataCloneError</code>"</span> <code>DOMException</code>.</p></li>
 
-     <li><p>If <var>targetRealm</var>'s <span
-     data-x="concept-settings-object-cross-origin-isolated-capability"
-     >cross-origin isolated capability</span> is false, then throw
-     <span>"<code>DataCloneError</code>"</span> <code>DOMException</code>.</p>
-
-     <p class="note">This check is only needed when deserializing (and not when serializing) as
-     <span data-x="concept-settings-object-cross-origin-isolated-capability">
-     cross-origin isolated capability</span> cannot change over time and a
-     <code>SharedArrayBuffer</code> cannot leave an <span>agent
-     cluster</span>.</p>
-     </li>
-
      <li><p>Otherwise, set <var>value</var> to a new SharedArrayBuffer object in
      <var>targetRealm</var> whose [[ArrayBufferData]] internal slot value is
      <var>serialized</var>.[[ArrayBufferData]] and whose [[ArrayBufferByteLength]] internal slot