diff --git a/index.html b/index.html
index c83e9cc3..11fc3fef 100644
--- a/index.html
+++ b/index.html
@@ -2953,6 +2953,19 @@ <h2>
           <a>payment methods</a> support this.
         </p>
       </section>
+      <section>
+        <h2>
+          Payment Handler Matching
+        </h2>
+        <p data-link-for="PaymentRequest">
+          For security reasons, a user agent can limit matching (in
+          <a>show()</a> and <a>canMakePayment()</a>) to <a>payment handlers</a>
+          from the same <a data-cite="rfc6454#section-3.2">origin</a> as a URL
+          <a>payment method identifier</a>. User agents can also use
+          information provided by a <a>payment method</a> owner to match
+          <a>payment handlers</a> from other origins.
+        </p>
+      </section>
     </section>
     <section id="privacy">
       <h2>