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The paper is concerned with the two-machine flow shop, where each job requires an additional resource (referred to as storage space) from the start of its first operation till the end of its second operation. The storage requirement of a job is determined by the processing time of its first operation. At any point in time, the total consumption of this additional resource cannot exceed a given limit (referred to as the storage capacity). The goal is to minimise the makespan, i.e. to minimise the time needed for the completion of all jobs. This problem is NP-hard in the strong sense. The paper analyses how the parameter -a lower bound on the storage capacity specified in terms of the processing times, affects the computational complexity.This paper considers the two-machine flow shop that is comprised of the firststage machine M 1 , the second-stage machine M 2 , and an additional resource referred to as a buffer or storage space. The machines must process a set of jobs N = {1, ..., n}. In order to be processed a job j ∈ N must be processed on