Update README.md

README.md

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 > GritLM is a generative representational instruction tuned language model. It unifies text representation (embedding) and text generation into a single model achieving state-of-the-art performance on both types of tasks.
 
 - **Repository:** [ContextualAI/gritlm](https://github.com/ContextualAI/gritlm)
-- **Paper:** [TODO](https://arxiv.org/abs/2308.07124)
+- **Paper:** https://arxiv.org/abs/2402.09906
 - **Logs:** https://wandb.ai/muennighoff/gritlm/runs/0uui712t/overview
 - **Script:** https://github.com/ContextualAI/gritlm/blob/main/scripts/training/train_gritlm_7b.sh