fix: update the README.md

README.md

@@ -76,3 +76,13 @@ This dataset serves as the foundation for PortBench's dual-layer evaluation. It
 
 All features strictly respect temporal integrity — no look-ahead bias. Any derived feature uses only information available at or before the corresponding date.
 
+### Citation
+
+```bibtex
+@article{zhao2026portbench,
+  title={PortBench: A Correlation-Aware, Full-Pipeline Benchmark for LLM-Driven Portfolio Management},
+  author={Zhao, Yuxuan and Chen, Sijia and Su, Ningxin},
+  journal={arXiv preprint arXiv:2605.27887},
+  year={2026}
+}
+```