writing a log-linear form

Cheers,
I am studying the work of Aguiar and Drumond (2007), and have the following equation:
rf(t+1)==alpha*E_t[rk(t+1)] + beta*r(t+1)
where E_t denotes rational expectation in t.
How I can write this equation in Dynare?
I am studying the work of Aguiar and Drumond (2007), and have the following equation:
rf(t+1)==alpha*E_t[rk(t+1)] + beta*r(t+1)
where E_t denotes rational expectation in t.
How I can write this equation in Dynare?