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First provide a summary of the paper, and then address the following criteria: Quality, clarity, originality and significance. Optimal decision-making with time-varying evidence reliability proposes a model of evidence accumulation (in humans and other animals) in a new, more flexible setting, whereby the evidence reliability can change on a short time scale, i.e. within a single trial. The authors propose a simple, but flexible model of evidence dynamics, derive the corresponding optimal policy and thoroughly discuss how it changes with each of the model's parameters. The meaning and role of every parameter is well explained and the authors provide additional intuitions for their results. The Supplementary Material is clear and compact and seems to provide all the necessary details of the algorithms used.