Update README.md

README.md

@@ -78,6 +78,15 @@ The evaluation code and usage guidelines are available in our [GitHub repository
 ## Citation
 
 ```bibtex
+@misc{li2025spatialladderprogressivetrainingspatial,
+      title={SpatialLadder: Progressive Training for Spatial Reasoning in Vision-Language Models}, 
+      author={Hongxing Li and Dingming Li and Zixuan Wang and Yuchen Yan and Hang Wu and Wenqi Zhang and Yongliang Shen and Weiming Lu and Jun Xiao and Yueting Zhuang},
+      year={2025},
+      eprint={2510.08531},
+      archivePrefix={arXiv},
+      primaryClass={cs.CV},
+      url={https://arxiv.org/abs/2510.08531}, 
+}
 ```