Help:How to use a shock of Markov chain?

I'm a new user of dynare and don't have much experience in using it.
However, I have to use a shock of Markov chain instead of using a AR(1) shock.
I have searched in user guide and haven't found how to add such kind of shock?
Can any person help me with it.? Thank you very much.
However, I have to use a shock of Markov chain instead of using a AR(1) shock.
I have searched in user guide and haven't found how to add such kind of shock?
Can any person help me with it.? Thank you very much.