A set of routes is not sufficient to benchmark route prediction methods as there are other factors that determine the search. One such factor is the stock, the set of purchasable compounds that serve as the stop condition for the search. For creating the routes in [21] the eMolecule database was used as stop criteria, and Genheden et al. created a stock from the ZINC database. Both of these alternatives are very extensive but we argue for not using such databases. Firstly, the extensiveness of the stocks could mask subtle differences between search algorithms as a route could be found by simply resorting to the stock rather than disconnecting molecules. Secondly, the quality and availability of the stock molecules are sometimes unclear, making the stop criteria arbitrary. Thirdly, databases such as eMolecules and ZINC are updated with time, making it hard to pick one representative snapshot of the database for the benchmark. We instead propose to simply use all the leaves of the 10,000 routes as stock molecules.