To further investigate this issue, we performed ai MD simulations of OH(aq) using periodic DFT, in a unit cell [OH(H 2 O) 63 ] that is thought to be large enough to avoid finite-size artifacts. One simulation employs the PBE0 + D3 functional at T = 370 K, consistent with the most recent hybrid DFT ai MD simulations of OH(aq), except that the unit cell is twice as large in the present work. (Details can be found in Section S1 of the Supporting Information.) Historically, ai MD simulations of liquid water using semilocal density functionals have been run at elevated temperature (often T = 350 K) in order to simulate the properties of the liquid at T = 298 K, which is an effort to counteract the fact that the liquid predicted by semilocal functionals is overstructured and glassy. At the PBE0 + D3 level, however, it is not clear that the use of an elevated temperature is warranted, 54 so we also performed simulations at T = 310 K. The normal freezing temperature of PBE0 + D3 water has recently been determined to be T = 268 K, 55 so both of our thermodynamic state points lie within the liquid regime.