On the First-Order Edgeworth Expansion for a Markov Chain

We consider the first-order Edgeworth expansion for summands related to a homogeneous Markov chain. Certain inaccuracies in some earlier results by Nagaev are corrected and the expansion is obtained under relaxed conditions. An application of our result to the distribution of the mle of a transition probability in the countable state space case is also considered.