J. Dunlop. (2012)cite arxiv:1205.1543Comment: Book Chapter, providing a thorough review of current knowledge of galaxies at redshifts z > 5. 71 pages, 28 figures, 314 references. To appear in "The First Galaxies - Theoretical Predictions and Observational Clues", 2012 by Springer, eds. V. Bromm, B. Mobasher, T. Wiklind.