diff --git a/README.md b/README.md
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 - [Architecture of a Database System](https://dsf.berkeley.edu/papers/fntdb07-architecture.pdf)
 - [Relational Database Index Design and the Optimizers](https://www.amazon.com/Relational-Optimizers-Lahdenmaki-published-Wiley-Blackwell/dp/B00EKYLFSI)
 - [Transactional Information Systems: Theory, Algorithms, and the Practice of Concurrency Control](https://www.sciencedirect.com/book/9781558605084/transactional-information-systems)
+- [SQL-99 Complete, Really](https://cratedb.com/docs/sql-99/en/latest/)
 
 ### Talks