update citation

README.md

@@ -104,6 +104,17 @@ The dataset is stored in JSON files. The quantity, including the conditioning im
 | Robotics               | 174        |
 | **Total Storage Size** | **226 MB** |
 
-## Reference(s)
+## Citation
 
-Not published yet. We will publish the paper later add the link to the paper when it’s ready.
+Paper is coming soon!
+
+If you use Physical AI Bench in your research, please cite:
+
+```bibtex
+@misc{PAIBench2025,
+  title={Physical AI Bench: A Comprehensive Benchmark for Physical AI Generation and Understanding},
+  author={Fengzhe Zhou and Jiannan Huang and Jialuo Li and Humphrey Shi},
+  year={2025},
+  url={https://github.com/SHI-Labs/physical-ai-bench}
+}
+```