Link HDTree arXiv paper in model card

README.md

@@ -13,6 +13,10 @@ tags:
 
 This repository hosts pretrained checkpoints for the public HDTree ICML release.
 
+Paper:
+- arXiv abstract: https://arxiv.org/abs/2506.23287
+- arXiv PDF: https://arxiv.org/pdf/2506.23287
+
 Code: https://github.com/zangzelin/code_HDTree_icml
 
 ## Files