Refer to Extensibility section from Contexts section.

index.html

@@ -692,10 +692,11 @@ <h2>Contexts</h2>
 
         <p>
 The data available at <code>https://w3.org/2018/credentials/v1</code>
-is a static document that is never updated and may thus be downloaded and
-cached client side. The associated vocabulary document for the
+is a static document that is never updated and MAY be downloaded and
+cached. The associated human-readable vocabulary document for the
 Verifiable Credentials Data Model can be found at the following URL:
-<code>https://w3.org/2018/credentials</code>.
+<a href="https://w3.org/2018/credentials">https://w3.org/2018/credentials</a>.
+This concept is expanded upon in Section <a href="#extensibility"></a>.
         </p>
       </section>