diff --git a/src/config.cpp b/src/config.cpp
index 6e8499cfd713dcc229e018a52ccc00ee0fc1272d..24f57dfe5468164855d8ecb9469aa270fc7c13f9 100644
--- a/src/config.cpp
+++ b/src/config.cpp
@@ -39,6 +39,9 @@ bool Config::load(const std::string &configfile, boost::program_options::options
 		("service.protocol", value<std::string>()->default_value(""), "Protocol")
 		("service.allowed_servers", value<std::string>()->default_value(""), "Only users from these servers can connect")
 		("service.server_mode", value<bool>()->default_value(false), "True if Spectrum should behave as server")
+		("service.users_per_backend", value<int>()->default_value(100), "Number of users per one legacy network backend")
+		("service.backend_host", value<std::string>()->default_value("localhost"), "Host to bind backend server to")
+		("service.backend_port", value<std::string>()->default_value("10000"), "Port to bind backend server to")
 		("registration.enable_public_registration", value<bool>()->default_value(true), "True if users should be able to register.")
 		("registration.language", value<std::string>()->default_value("en"), "Default language for registration form")
 		("registration.instructions", value<std::string>()->default_value(""), "Instructions showed to user in registration form")