Add citation for latest preprint in README

README.md

@@ -46,9 +46,10 @@ Alternatively, the software using the file could itself be licensed in a way com
 
 ## How to cite
 
-If you use OPTIMADE to access or host data, we kindly ask that you cite our paper:
+If you use OPTIMADE to access or host data, we kindly ask that you cite our papers accompaying the version 1.0 and 1.2 releases:
 
 - Andersen *et al*, OPTIMADE, an API for exchanging materials data, *Sci. Data* **8**, 217 (2021) [10.1038/s41597-021-00974-z](https://doi.org/10.1038/s41597-021-00974-z)
+- Evans *et al*, Developments and applications of the OPTIMADE API for materials discovery, design, and data exchange, *arXiv preprint* (2024) [10.48550/arXiv.2402.00572](https://doi.org/10.48550/arXiv.2402.00572)
 
 To cite an individual version of the specification, please use the versioned records on Zenodo: