Update README.md

README.md

@@ -12,4 +12,15 @@ Altogether, it consists of almost 19k questions. It has previously been used to
 
 https://huggingface.co/spaces/amu-cai/LLMZSZL_Leaderboard
 
-"arxiv link"
+This is a dataset used and described in:
+```
+@misc{jassem2025llmzszlcomprehensivellmbenchmark,
+      title={LLMzSz{\L}: a comprehensive LLM benchmark for Polish}, 
+      author={Krzysztof Jassem and Michał Ciesiółka and Filip Graliński and Piotr Jabłoński and Jakub Pokrywka and Marek Kubis and Monika Jabłońska and Ryszard Staruch},
+      year={2025},
+      eprint={2501.02266},
+      archivePrefix={arXiv},
+      primaryClass={cs.CL},
+      url={https://arxiv.org/abs/2501.02266}, 
+}
+```