Accurately describe dependence on registries.

Co-authored-by: Markus Sabadello <[email protected]>
Co-authored-by: Manu Sporny <[email protected]>

index.html

@@ -279,8 +279,17 @@ <h1>
     </p>
 
     <p>
-This design eliminates dependence on centralized registries for identifiers as
-well as centralized certificate authorities for key management, which is the
+This specification utilizes registries to enable interoperable definitions of
+<a>DID document</a> property names defined by this and other specifications,
+<a>DID method</a> names, DID parameter names,
+and cryptographic algorithm identifiers.
+Some of these registries are operated by the W3C DID Working group
+and others are operated by other standards organizations, including the IETF.
+    </p>
+
+    <p>
+This design eliminates dependence on centralized registries
+for identifier and key management, which is the
 standard in hierarchical <a
 href="https://en.wikipedia.org/wiki/Public_key_infrastructure">
   PKI (public key infrastructure</a>).