Update README.md

README.md

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 ![SaShiMi](assets/sashimi.png "SaShiMi Architecture")
 > **It's Raw! Audio Generation with State-Space Models**\
 > Karan Goel, Albert Gu, Chris Donahue, Christopher Ré\
-> Paper: https://arxiv.org/abs/xxxx.yyyyy
+> Paper: https://arxiv.org/pdf/2202.09729.pdf
 
 This repository contains a release of the artifacts for the SaShiMi paper. To use our code and artifacts in your research, please refer to the instructions at [https://github.com/HazyResearch/state-spaces/tree/main/sashimi](https://github.com/HazyResearch/state-spaces/tree/main/sashimi).