Light composite states naturally arise in models of Composite Higgs. In particular, in models featuring an underlying gauge-fermion description, the properties of those companions of the composite Higgs can be predicted. We focus on a special fellow, ubiquitous to all models, associated to an anomaly-free U(1). Various searches for resonances already give the most stringent bounds on the Higgs decay constant. We also propose a boosted ditau search to cover the elusive mass range 14 < M < 65 GeV.