  We provide a categorification of $\mathfrak{q}(2)$-crystals on the singular
$\mathfrak{gl}_{n}$-category ${\mathcal O}_{n}$. Our result extends the
$\mathfrak{gl}_{2}$-crystal structure on ${\rm Irr} ({\mathcal O}_{n})$ defined
by Bernstein-Frenkel-Khovanov. Further properties of the ${\mathfrak
q}(2)$-crystal ${\rm Irr}({\mathcal O}_{n})$ are also discussed.
