diff --git a/source b/source
index 8ed79761010..2b453b2398b 100644
--- a/source
+++ b/source
@@ -106624,11 +106624,6 @@ new PaymentRequest(…); // Allowed to use
 
    <dd><p>The <span>principal realm</span> which this synthetic realm exists within.</p></dd>
 
-   <dt><p>An <dfn data-x="synthetic-realm-settings-object-underlying-realm" for="synthetic realm
-   settings object">underlying realm</dfn></p></dt>
-
-   <dd><p>The <span>synthetic realm</span> which this settings object represents.</p></dd>
-
    <dt><p>A <dfn data-x="synthetic-realm-settings-object-module-map" for="synthetic realm settings
    object">module map</dfn></p></dt>
 
@@ -111466,10 +111461,6 @@ import "https://example.com/foo/../module2.mjs";</code></pre>
    data-x="synthetic-realm-settings-object-principal-realm">principal realm</span> to <var>O</var>'s
    <span>associated realm</span>.</p></li>
 
-   <li><p>Set <var>settings</var>'s <span
-   data-x="synthetic-realm-settings-object-underlying-realm">underlying realm</span> to
-   <var>realm</var>.</p></li>
-
    <li><p>Set <var>settings</var>'s <span data-x="synthetic-realm-settings-object-module-map">module
    map</span> to a new <span>module map</span>, initially empty.</p></li>