diff --git a/source b/source
index 272f5c1bada..3f73a2aa0c8 100644
--- a/source
+++ b/source
@@ -89120,12 +89120,18 @@ interface <dfn>ApplicationCache</dfn> : <span>EventTarget</span> {
    script">module scripts</span>; or null. In the former two cases, it represents a parsed script;
    null represents a failure parsing.</p></dd>
 
-   <dt>A <dfn data-dfn-for="script" data-export="" data-x="concept-script-parse-error">parse
-   error</dfn></dt>
+   <dt>A <dfn data-dfn-for="script" data-x="concept-script-parse-error">parse error</dfn></dt>
 
-   <dd><p>A JavaScript value, which has meaning only if the <span
-   data-x="concept-script-record">record</span> is null, indicating that the corresponding script
-   source text could not be parsed.</p></dd>
+   <dd>
+    <p>A JavaScript value, which has meaning only if the <span
+    data-x="concept-script-record">record</span> is null, indicating that the corresponding script
+    source text could not be parsed.</p>
+
+    <p class="note">This value is used for internal tracking of immediate parse errors when <a
+    href="#creating-scripts">creating scripts</a>, and is not to be used directly. Instead, consult
+    the <span data-x="concept-script-error-to-rethrow">error to rethrow</span> when determining
+    "what went wrong" for this script.</p>
+  </dd>
 
    <dt>An <dfn data-dfn-for="script" data-export="" data-x="concept-script-error-to-rethrow">error
    to rethrow</dfn></dt>
@@ -89134,6 +89140,11 @@ interface <dfn>ApplicationCache</dfn> : <span>EventTarget</span> {
     <p>A JavaScript value representing an error that will prevent evaluation from succeeding. It
     will be re-thrown by any attempts to <a href="#calling-scripts">run</a> the script.</p>
 
+    <p class="note">This could be the script's <span data-x="concept-script-parse-error">parse
+    error</span>, but in the case of a <span>module script</span> it could instead be the
+    <span data-x="concept-script-parse-error">parse error</span> from one of its dependencies, or
+    an error from <span>resolve a module specifier</span>.</p>
+
     <p class="note">Since this exception value is provided by the JavaScript specification, we know
     that it is never null, so we use null to signal that no error has occurred.</p>
    </dd>