Update stack-identifier.md

Author: shannona

_includes/stack-identifier.md

@@ -2,5 +2,7 @@ _Digital identifiers are required to say who's who on the internet, but there's
 
 * **Cliques.** Identity on the internet has usually been locked into the Single Signature Paradigm. Cliques instead imagine edge identifiers and cryptographic cliques that exist to denote relationships.
    * See our [Cliques page](/cliques/)
+* **Gordian Clubs.** Autonomous cryptographic objects that allow for the access-controlled and decentralized release of data.
+   * See our [Gordian Clubs page](/clubs]
 * **XIDs.** Extensible Identifiers. A napkin sketch of how you can use Gordian Envelope and dCBOR to create create DID-like controller docs.
    * See our [XID page](/xid/)