In India, mostly farmers are with small and marginal holding. To improve their agricultural productivity and income generation, crop diversification is required. Mushroom cultivation as an enterprise has the potentiality to generate additional income. Sri Hariom Prasad Jaiswal, a farmer of Begusarai district started small scale mushroom cultivation along with his traditional agricultural practice. He generated an additional income of Rs.19,000.00/- in a season from mushroom production along with his regular income from traditional farming. Considering limited land with farmers, mushroom cultivation could be a promising option for supplementary income generation for small-holding farmers.