  LHCb, CDF and most recently Belle have observed a large difference between
direct CP asymmetries in $D^0\to K^+K^-$ and $D^0\to\pi^+\pi^-$. We use the
measured value of $\Delta A_{CP}$ to constrain the magnitude and strong phase
of a QCD-enhanced standard model penguin and predict its effects on direct CP
asymmetry in $D^0\to\pi^0\pi^0$ and $D^+\to K^+\bar{K}^0$.
