diff --git a/vona/federation/__init__.py b/vona/federation/__init__.py
index 3976c60..d81f556 100644
--- a/vona/federation/__init__.py
+++ b/vona/federation/__init__.py
@@ -477,3 +477,10 @@ async def space_hierachy(roomId):
 		"errcode": "M_NOT_FOUND",
 		"error": "Room does not exist."
 	}), 404
+
+
+@server.route("/_matrix/federation/v1/org.matrix.msc4358/discover_common_rooms", methods=["POST"])
+@server.route("/_matrix/federation/v1/discover_common_rooms", methods=["POST"])
+async def discover_common_rooms():
+	tags = request.json.get("room_participation_tags", [])
+	return jsonify({"recognised_tags": tags})