Psychrometry & Moist Air Thermodynamics

Referring to the psychrometric process, air with humidity ratio $\omega = 0.012\text{ kg/kg dry air}$ is heated. Using the formula $c_s = 1.005 + 1.88 \omega$, calculate the humid specific heat $c_s$ in $\text{kJ/(kg}\cdot\text{K)}$ (round off to three decimal places).