diff --git a/spectrum_manager/src/APIServer.cpp b/spectrum_manager/src/APIServer.cpp
index e06c9d418110d055c72b49c3733c2c5545b1bb29..1a83aaa2e8c1cba3eecda378b72a2c845cf84a91 100644
--- a/spectrum_manager/src/APIServer.cpp
+++ b/spectrum_manager/src/APIServer.cpp
@@ -152,6 +152,10 @@ void APIServer::serve_instances_list_rooms(Server *server, Server::session *sess
 	Document json;
 	json.SetObject();
 	json.AddMember("error", 0, json.GetAllocator());
+	json.AddMember("name_label", "Nickname in 3rd-party room", json.GetAllocator());
+	json.AddMember("legacy_room_label", "3rd-party room name", json.GetAllocator());
+	json.AddMember("legacy_server_label", "3rd-party server", json.GetAllocator());
+	json.AddMember("frontend_room_label", "Slack channel", json.GetAllocator());
 
 	std::vector<std::vector<std::string> > tmp;
 	Value rooms(kArrayType);
diff --git a/spectrum_manager/src/html/js/app.js b/spectrum_manager/src/html/js/app.js
index f0312a7b39337dd5c1f30f62a0ec29542f3a628f..e6cda348891cdf52787527003ccb51c4f8a7533b 100644
--- a/spectrum_manager/src/html/js/app.js
+++ b/spectrum_manager/src/html/js/app.js
@@ -137,7 +137,7 @@ function fill_instances_join_room_form() {
 		var postdata ={
 			"name": $("#name").val(),
 			"legacy_room": $("#legacy_room").val(),
-			"legacy_server": $("#legacy_server").val()
+			"legacy_server": $("#legacy_server").val(),
 			"frontend_room": $("#frontend_room").val()
 		};