add citation

README.md

@@ -181,5 +181,19 @@ Because these are generated videos:
 
 Anyone redistributing results should clearly label them as synthetic model outputs.
 
-
+## Citation
+
+If you find AVGen-Bench useful, please cite:
+
+```bibtex
+@misc{zhou2026avgenbenchtaskdrivenbenchmarkmultigranular,
+      title={AVGen-Bench: A Task-Driven Benchmark for Multi-Granular Evaluation of Text-to-Audio-Video Generation}, 
+      author={Ziwei Zhou and Zeyuan Lai and Rui Wang and Yifan Yang and Zhen Xing and Yuqing Yang and Qi Dai and Lili Qiu and Chong Luo},
+      year={2026},
+      eprint={2604.08540},
+      archivePrefix={arXiv},
+      primaryClass={cs.CV},
+      url={https://arxiv.org/abs/2604.08540}, 
+}
+```