updated README

README.md

@@ -5,6 +5,7 @@ colorFrom: pink
 colorTo: blue
 sdk: static
 pinned: false
+license: cc-by-sa-4.0
 ---
 
 # Welcome to RLHN
@@ -17,3 +18,19 @@ List of Contributors:
 - Crystina Zhang*
 - Xueguang Ma
 - Jimmy Lin
+
+Preprint URL: https://huggingface.co/papers/2505.16967
+
+# Citation
+
+```
+@misc{thakur2025rlhn,
+      title={Fixing Data That Hurts Performance: Cascading LLMs to Relabel Hard Negatives for Robust Information Retrieval}, 
+      author={Nandan Thakur and Crystina Zhang and Xueguang Ma and Jimmy Lin},
+      year={2025},
+      eprint={2505.16967},
+      archivePrefix={arXiv},
+      primaryClass={cs.IR},
+      url={https://arxiv.org/abs/2505.16967}, 
+}
+```