Phase I proposers should note that the ACS ETC does not take into account the effects of CTE when predicting S/N ratios. While the pixel-based CTE correction code of Anderson & Bedin will correct the CTE trails by restoring the flux to the source, it will not improve the S/N in the source to be equivalent to that without the effects of CTE. Proposers are therefore advised to consult the ISR of Chiaberge et al. to determine the percentage of flux lost and increase their exposure times accordingly.