Default move constructor

I have a class like

class MyMatrix {
public:
    MyMatrix() = default;
    MyMatrix(const MyMatrix&) = default;
    ~MyMatrix() = default;

    // some custom methods..

private:
   std::vector<float> data;
}

since I have all my data in a vector I thought that RAII should take care of the memory.

My question is: should I also include a MyMatrix(MyMatrix&&) = default; line? Would my code benefit from this at all or would I do something wrong if I did?