R. Bouwens, G. Illingworth, P. Oesch, J. Caruana, B. Holwerda, R. Smit, and S. Wilkins. (2015)cite arxiv:1503.08228Comment: 16 pages, 10 figures, 3 tables, submitted to the Astrophysical Journal, Figure 6 shows the main result of the paper, Table 1 includes a compilation of the many key constraints on the ionisation state of the universe at z>6.