Update README.md

README.md

@@ -50,5 +50,13 @@ Compute: 4× NVIDIA H200 GPUs
 ## 📄 Citation
 
 ```bibtex
-xxx
+@misc{hui2026sttarenarealisticenvironmenttoolusing,
+      title={STT-Arena: A More Realistic Environment for Tool-Using with Spatio-Temporal Dynamics}, 
+      author={Tingfeng Hui and Hao Xu and Pengyu Zhu and Hongsheng Xin and Kun Zhan and Sen Su and Chunxiao Liu and Ning Miao},
+      year={2026},
+      eprint={2605.18548},
+      archivePrefix={arXiv},
+      primaryClass={cs.CL},
+      url={https://arxiv.org/abs/2605.18548}, 
+}
 ```