The hydrogen bond network of water is composed of a combination of short, straight, and robust bonds as well as longer, weak, and bent interactions. The strength of a hydrogen bond is consequently highly correlated with its length and angular orientation. At finite temperature, the elongation of the H-bonds competes with the cohesive effects of vdW interactions, which explains why the h number is in general higher and in better agreement with experimental data with dispersion corrections without altering significantly the angular distribution 121 . In contrast, both h and the angular distribution vary when considering different fractions of exact exchange; Fig. shows that h increases for M06-HF (100%), M06-2X (54%), M08-HX (52%), M08-SO (57%), while it is too low for M06 (27%), M11 (43-100%), MN12-SX (25-0%) and MN15 (44%). At the same time, H-bonds become shorter (Fig. , g OH ) and straighter (Fig. ) when augmenting the fraction of exact exchange from M06 (27%) to M06-2X (54%) to M06-HF (100%). Hydrogen bonds are therefore particularly more sensitive to exchange effects than to correlation ones. Incorporating more exact exchange strengthens the hydrogen bonds and results in a more rigid structure of water.