Add citation

README.md

@@ -89,18 +89,21 @@ This dataset enables:
 - **Fragmentation Research**: Exploring relationships between peptide sequence context and fragmentation behavior
 - **Quality Control**: Identifying problematic spectra through unexpected fragmentation patterns
 
-<!-- ## 📖 Citation
+## 📖 Citation
 
 If you use this dataset in your research, please cite:
 
 ```bibtex
-@article{pep2prob2025,
-  title={Pep2Prob Benchmark: Predicting Fragment Ion Probability for MS²-based Proteomics},
-  author={[Authors]},
-  journal={},
-  year={2025}
+@misc{xu2025pep2prob,
+      title={Pep2Prob Benchmark: Predicting Fragment Ion Probability for MS$^2$-based Proteomics}, 
+      author={Hao Xu and Zhichao Wang and Shengqi Sang and Pisit Wajanasara and Nuno Bandeira},
+      year={2025},
+      eprint={2508.21076},
+      archivePrefix={arXiv},
+      primaryClass={q-bio.BM},
+      url={https://arxiv.org/abs/2508.21076}, 
 }
-``` -->
+```
 
 ## 📄 License