Update README.md

README.md

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 MD-Judge is a LLM-based safetyguard, fine-tund on top of [Mistral-7B](https://huggingface.co/mistralai/Mistral-7B-v0.1). MD-Judge serves as a classifier to evaluate the safety of QA pairs.
 
 MD-Judge was born to study the safety of different LLMs serving as an general evaluation tool, which is proposed under the 🥗SALAD-Bench. You can check the following source for more information:  
-- [**Paper**](https://arxiv.org/abs/2402.02416) 
+- [**Paper**](https://arxiv.org/pdf/2402.05044) 
 - [**Code**](https://github.com/OpenSafetyLab/SALAD-BENCH)
 - [**Data**](https://huggingface.co/datasets/OpenSafetyLab/Salad-Data)
 - [**Project Page**](https://adwardlee.github.io/salad_bench/)