Multiciliated cells (MCCs) are found on various epithelia where they drive fluid flow – such as in the airways, the brain ventricles, and the skin of Xenopus embryos. Their differentiation is known to be coordinated by transcriptional regulators such as Multicilin and Gemc1, as well as by the key transcription factor Foxj1, which is also required for cilium formation in cells that produce just a single motile cilium. On p. 4654, Chris Kintner and colleagues identify another transcription factor required for proper differentiation of MCCs – Foxn4. Through an elegant combination of morpholino and CRISPR-based loss-of-function technologies, they show that loss of foxn4 disrupts docking of basal bodies to the cell surface – an essential prerequisite for cilium extension. This phenotype is reminiscent of the foxj1 phenotype, except that it largely recovers over time and that foxn4 has no apparent effect on cells with a single cilium. Through RNAseq and ChIPseq analyses, the authors find that Foxn4 promotes expression of a subset of Foxj1 targets. They propose that Foxn4, acting downstream of Multicilin, might be required to promote high-level expression of Foxj1 target genes that may be necessary for efficient generation of multiple cilia.