Add arxiv paper link

README.md

@@ -13,6 +13,7 @@ language:
 
 **TokenHD** is a token-level hallucination detector trained on top of [Qwen/Qwen3-4B](https://huggingface.co/Qwen/Qwen3-4B) using the TokenHD pipeline. It assigns a hallucination probability to each token in an LLM-generated response, enabling fine-grained localization of errors without requiring predefined step segmentation.
 
+Paper: [arxiv.org/abs/2605.12384](https://arxiv.org/abs/2605.12384)  
 Code: [github.com/rmin2000/TokenHD](https://github.com/rmin2000/TokenHD)  
 Training Data: [mr233/TokenHD-training-data](https://huggingface.co/datasets/mr233/TokenHD-training-data)