  The standard model contribution to $\epsilon'/\epsilon$ of the magnetic- and
electric-dipole penguin operators $Q_{11} = \frac{g_s}{16\pi^2} \, m_s \:
\bar{s}\, \sigma_{\mu\nu} t^a G^{\mu\nu}_a (1-\gamma_5 )\, d $ and $Q_{12} =
\frac{eQ_d}{16\pi^2}\, m_s \: \bar{s}\, \sigma_{\mu\nu}
  F^{\mu\nu} (1-\gamma_5 )\, d $ is discussed. While the electromagnetic
penguin $Q_{12}$ seems to have a vanishingly small matrix element, we find that
the gluonic dipole operator $Q_{11}$ may give a contribution to
$\epsilon'/\epsilon$ comparable to that of other operators so far considered,
and should therefore be consistently included in the analysis.
