  In this paper we study the modulus of continuity of weak solutions to a
singular elliptic equation in the plane under very weak assumption on the
integrability of the elliptic coefficients. Our investigation reveals that the
modulus of continuity can be described by the reciprocal of the logarithmic
function raised to a power. However, the power can be arbitrarily large. This
is in sharp contrast with a result by J. Onninen and X. Zhong for a degenerate
elliptic equation in the plane, in which the power must be suitably small.
