Additions per code review

index.bs

@@ -5137,6 +5137,12 @@ useful when constructing the exception's [=exception/message=].
  <blockquote>
  <p>Let <var ignore>object</var> be a newly [=created=] "{{SyntaxError}}" {{DOMException}}.
  </blockquote>
+
+ <p>To [=reject=] a promise with a new {{DOMException}} with [=error name=] "{{OperationError}}":
+
+ <blockquote>
+ [=Reject=] <var ignore>p</var> with an "{{OperationError}}" {{DOMException}}.
+ </blockquote>
 </div>
 
 <div class=example id=example-exception-throwing-message-hint>
@@ -14474,6 +14480,10 @@ A {{DOMException}} is represented by a
  situation. The calling specification may contain information to to help implementations
  construct this message.
 
+ Implementations need to be cautious not to leak sensitive or secured information when
+ constructing this message, e.g., by including the [=Document/URL=] of a cross-origin frame,
+ or information which could identify the user.
+
  1. Let |args| be « |message| ».
 
  1. Let |constructor| be [=current realm=].\[[Intrinsics]].[[%|T|%]].