  Filip showed that there are constants $C>0$ and $\delta>0$ such that the
number of special Lagrangian fibrations of volume $\leq V$ in a generic twistor
family of K3 surfaces is $C\cdot V^{20}+O(V^{20-\delta})$.
  In this note, we show that $\delta$ can be taken to be any number
$0<\delta<\frac{4}{697633}$.
