diff --git a/actor.go b/actor.go
index 2a80990..a9e7321 100644
--- a/actor.go
+++ b/actor.go
@@ -286,6 +286,7 @@ func (a *Actor) whoAmI() string {
 		"publicKeyPem": a.publicKeyPem,
 	}
 	self["gateways"] = a.gateways
+	self["sameAs"] = []string{"ap://did:key:" + encoded + "/actor"}
 	selfString, _ := json.Marshal(self)
 	return string(selfString)
 }