Addendum to: Nature Photonics, published online 2 August 2021.

The authors wish to acknowledge the following highly relevant manuscript should have been cited in this Article:

Toso, S., Baranov, D., Giannini, C., Marras, S. & Manna, L. Wide-angle X-ray diffraction evidence of structural coherence in CsPbBr3 nanocrystal superlattices. ACS Mater. Lett. 1, 272–276 (2019).

This manuscript describes how X-ray diffraction experiments and associated mathematical modelling and data analysis have previously identified and characterized a superlattice structure in colloidal perovskite nanocrystals. Further analysis of these structures is also described in this Article:

Toso, S. et al. Multilayer diffraction reveals that colloidal superlattices approach the structural perfection of single crystals. ACS Nano 15, 6243–6256 (2021).