Update README.md

README.md

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 OctoCoder is an instruction tuned model with 15.5B parameters created by finetuning StarCoder on CommitPackFT & OASST as described in the OctoPack paper.
 
 - **Repository:** [bigcode/octopack](https://github.com/bigcode-project/octopack)
-- **Paper:** [TODO]()
+- **Paper:** [OctoPack: Instruction Tuning Code Large Language Models](https://arxiv.org/abs/2308.07124)
 - **Languages:** 80+ Programming languages
 - **OctoPack🐙🎒:**
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