Update README.md

README.md

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 [CVPR 2026] Official checkpoints for the paper **"Understanding and Enforcing Weight Disentanglement in Task Arithmetic"**.
 
-[[Paper](https://arxiv.org/abs/XXXX.XXXXX)]   [[Code](https://github.com/RL-MIND/OrthoReg)]
+[[Paper](https://arxiv.org/abs/2604.17078)]   [[Code](https://github.com/RL-MIND/OrthoReg)]
 
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