We believe that the good performance, in spite of a much lower total number of datapoints, reflects the effectiveness of cleaning and checking data. Future efforts should focus on refining the reference data in the solvents that were not explored in this work, which will enable development of accurate predictive models for those solvent media. We also suggest pretraining on pK a values computed using quantum-chemical methods on a broad range of solutes/solvents, to allow more reliable predictions for solvents and solutes very different from those studied experimentally.