diff --git a/source b/source
index 127eff3143d..ac9493aa262 100644
--- a/source
+++ b/source
@@ -74003,11 +74003,11 @@ dictionary <dfn dictionary>ElementDefinitionOptions</dfn> {
 
    <li><p>If <span>this</span>'s <span>is scoped</span> is true, then for each <var>document</var>
    of <span>this</span>'s <span>scoped document set</span>: <span>upgrade particular elements within
-   a document</span> given <var>document</var>, <var>definition</var>, and
+   a document</span> given <span>this</span>, <var>document</var>, <var>definition</var>, and
    <var>localName</var>.</p></li>
 
    <li><p>Otherwise, <span>upgrade particular elements within a document</span> given
-   <span>this</span>'s <span>relevant global object</span>'s <span
+   <span>this</span>, <span>this</span>'s <span>relevant global object</span>'s <span
    data-x="concept-document-window">associated <code>Document</code></span>, <var>definition</var>,
    <var>localName</var>, and <var>name</var>.</p></li>
 
@@ -74025,16 +74025,17 @@ dictionary <dfn dictionary>ElementDefinitionOptions</dfn> {
    </li>
   </ol>
 
-  <p>To <dfn>upgrade particular elements within a document</dfn> given a <code>Document</code>
-  object <var>document</var>, a <span>custom element definition</span> <var>definition</var>, a
-  string <var>localName</var>, and optionally a string <var>name</var> (default
-  <var>localName</var>):</p>
+  <p>To <dfn>upgrade particular elements within a document</dfn> given a
+  <code>CustomElementRegistry</code> object <var>registry</var>, a <code>Document</code> object
+  <var>document</var>, a <span>custom element definition</span> <var>definition</var>, a string
+  <var>localName</var>, and optionally a string <var>name</var> (default <var>localName</var>):</p>
 
   <ol>
    <li><p>Let <var>upgradeCandidates</var> be all elements that are <span data-x="shadow-including
-   descendant">shadow-including descendants</span> of <var>document</var>, whose namespace
-   is the <span>HTML namespace</span> and whose local name is <var>localName</var>, in
-   <span>shadow-including tree order</span>. Additionally, if <var>name</var> is not
+   descendant">shadow-including descendants</span> of <var>document</var>, whose <span
+   data-x="element-custom-element-registry">custom element registry</span> is <var>registry</var>,
+   whose namespace is the <span>HTML namespace</span>, and whose local name is <var>localName</var>,
+   in <span>shadow-including tree order</span>. Additionally, if <var>name</var> is not
    <var>localName</var>, only include elements whose <span data-x="concept-element-is-value"><code
    data-x="">is</code> value</span> is equal to <var>name</var>.</p></li>