diff --git a/include/ircd/m/device.h b/include/ircd/m/device.h
index de53acc6f..5a3f9edce 100644
--- a/include/ircd/m/device.h
+++ b/include/ircd/m/device.h
@@ -53,11 +53,14 @@ struct ircd::m::signing_key_update
 	/// Required. The user ID whose cross-signing keys have changed.
 	json::property<name::user_id, json::string>,
 
-	/// Cross signing key
+	/// Master signing key
 	json::property<name::master_key, json::object>,
 
-	/// Cross signing key
-	json::property<name::self_signing_key, json::object>
+	/// Self signing key
+	json::property<name::self_signing_key, json::object>,
+
+	/// User signing key (local only)
+	json::property<name::user_signing_key, json::object>
 >
 {
 	using super_type::tuple;
diff --git a/include/ircd/m/name.h b/include/ircd/m/name.h
index af59171a0..49d87f385 100644
--- a/include/ircd/m/name.h
+++ b/include/ircd/m/name.h
@@ -221,4 +221,5 @@ struct ircd::m::name
 	static constexpr const char *const usage {"usage"};
 	static constexpr const char *const master_key {"master_key"};
 	static constexpr const char *const self_signing_key {"self_signing_key"};
+	static constexpr const char *const user_signing_key {"user_signing_key"};
 };
diff --git a/matrix/name.cc b/matrix/name.cc
index f5407590c..3a37385fe 100644
--- a/matrix/name.cc
+++ b/matrix/name.cc
@@ -200,3 +200,4 @@ constexpr const char *const ircd::m::name::m_in_reply_to;
 constexpr const char *const ircd::m::name::usage;
 constexpr const char *const ircd::m::name::master_key;
 constexpr const char *const ircd::m::name::self_signing_key;
+constexpr const char *const ircd::m::name::user_signing_key;