Why random distribution objects can be initialized by a constructor via {}, other than ()?

I found today there two different code segments which show usage of random distribution functions.

First one, a constructor was called, followed by "()", that's familiar to me.

    std::uniform_int_distribution<> dis(1, 6);

Second one, an object is constructed thru a "{}", that's confused me.

    std::normal_distribution<> d{5,2};

I've test these two examples: first(https://en.cppreference.com/w/cpp/numeric/random/uniform_int_distribution) and second(https://en.cppreference.com/w/cpp/numeric/random/normal_distribution), and they works well.

I've not seen syntax like the second example, can some one show me, thx.