update readme doi link

README.md

@@ -116,15 +116,16 @@ be found on the project [Github](https://github.com/ylaboratory/methylation-clas
 ## Citation
 
 If you use this dataset in your work, please cite:
-> Kim et al., “Ontology‑aware DNA methylation classification with a curated atlas of human tissues and cell types”, \[bioRxiv preprint\] (2025).
+> Kim, M., Dannenfelser, R., Cui, Y., Allen, G., & Yao, V. (2025). *Ontology‑aware DNA methylation classification with a curated atlas of human tissues and cell types* [Preprint]. bioRxiv. https://doi.org/10.1101/2025.04.18.649618
 
 ```
-@article{kim2024methylation_atlas,
+@article{kim2025methylation_atlas,
   title   = {Ontology-aware DNA methylation classification with a curated atlas of human tissues and cell types},
   author  = {Kim, Mirae and Dannenfelser, Ruth and Cui, Yufei and Allen, Genevera and Yao, Vicky},
-  journal = {bioRxiv preprint},
+  journal = {bioRxiv},
   year    = {2025},
-  doi     = {10.1101/2024.XX.XXXXXX}
+  doi     = {10.1101/2025.04.18.649618},
+  note    = {Preprint}
 }
 ```