R. Bouwens, P. van Dokkum, G. Illingworth, P. Oesch, M. Maseda, B. Ribeiro, and D. Lam. (2017)cite arxiv:1711.02090Comment: 23 pages, 14 figures, 4 tables, submitted to the Astrophysical Journal, Figures 9 and 10 show comparisons with the sizes and luminosities of local star cluster complexes and evolved objects, respectively, Figure 11 presents our constraints on the z~6 proto-globular cluster LF.