Update README.md

README.md

@@ -31,5 +31,13 @@ This is an older step-conditional control model for our paper used only for the
 # Citation
 
 ```bibtex
-TODO
+@misc{muennighoff2025s1simpletesttimescaling,
+      title={s1: Simple test-time scaling}, 
+      author={Niklas Muennighoff and Zitong Yang and Weijia Shi and Xiang Lisa Li and Li Fei-Fei and Hannaneh Hajishirzi and Luke Zettlemoyer and Percy Liang and Emmanuel Candès and Tatsunori Hashimoto},
+      year={2025},
+      eprint={2501.19393},
+      archivePrefix={arXiv},
+      primaryClass={cs.CL},
+      url={https://arxiv.org/abs/2501.19393}, 
+}
 ```