We recently reported on the design of two novel 2D imine covalent organic frameworks (COFs), DUT-175 and DUT- 176 (where DUT stands for Dresden University of Technology), based on the 9H-carbazole tetratopic aldehyde and linear aromatic diamines. We showed that reversible protonation of the imine nitrogen leads to electronic structure changes in the conjugated ?-system of the frameworks, further leading to a characteristic colorimetric pH response in a wide range without COF decomposition. The pore sizes of the COFs shown in Figure 1a in the original publication were extracted from the crystal structures and confirmed by argon physisorption experiments. However, a typo slipped into that figure: we provided the pore length for DUT-175 as 17.7 instead of 25.7 . The correct representation of Figure 1a is given herein (the other parts of the figure are unaffected by this change). (Figure Presented).