  We present an elegant exact formula for the gaugino $\beta$-function in a
softly-broken supersymmetric gauge theory, of the form $\beta_M = {\cal
O}(\beta_g/g)$, where $\beta_g$ is the gauge $\beta$ function and ${\cal O}$ is
a simple differential operator acting on the gauge coupling $g$ and the Yukawa
coupling.
