Colour-magnitude diagram comparing K1 absolute magnitudes and K1–K2 colours of a range of low-mass stellar andsubstellar objects from the literature. Synthetic K1 and K2 fluxes were computed for each target from published spectra. A number of young and dusty companions observed with SPHERE or with published K-band spectra were added to the diagram. HIP 64892B falls in a similar location to PZ Tel B and HIP 78530B, both young brown dwarfs with late-M spectral types.