+# The fact that actors can return an int is a legacy behavior for MSG
+.. autodoxymethod:: simgrid::s4u::Engine::register_default(const kernel::actor::ActorCodeFactory &factory)
+.. autodoxymethod:: simgrid::s4u::Engine::register_default(int(*code)(int, char **))
+.. autodoxymethod:: simgrid::s4u::Engine::register_function(const std::string &name, const kernel::actor::ActorCodeFactory &factory)
+.. autodoxymethod:: simgrid::s4u::Engine::register_function(const std::string &name, int(*code)(int, char **))
+