It is shown that the simple semi-analytical formula which involves a convolution of the Born asymmetry with the photon spectrum agrees to a precision better than LEP’s experimental error with exact O(α) result for the forward-backward asymmetry. The exact O(α) result differs from the convolution by 0.5×10−3 at the Z peak and by less than 3 ×10−3 close to Z peak. The result was obtained without kinematical cut-offs.