The paper 'Early science with the Large Millimeter Telescope: observations of extremely luminous high-z sources identified by Planck' was originally published in MNRAS 458(4), 4383-4399 (Harrington et al. 2016). The interstellarmedium (ISM) mass estimates in Harrington et al. (2016), discussed in Section 6.2.2 and reported in Table 4, utilized equation (16) by Scoville et al. (2016), which was later reported to include a typographical error with the ratios of Γ inverted. The corrected ISM masses are shown in the updated Table 1, and the estimates are, on average, about twice as large as previously reported. We once again thank Mihwa Han for her meticulous observation in the original version of Scoville et al. (2016). (Table Presented).