diff --git a/README.md b/README.md
index a6ecb3e..ad2006e 100644
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@@ -581,11 +581,12 @@ An updated and curated list of selected readings to illustrate best practices in
 	* [Top 10 System Design Interview Questions ](https://hackernoon.com/top-10-system-design-interview-questions-for-software-engineers-8561290f0444)
 	* [Top 10 Common Large-Scale Software Architectural Patterns in a Nutshell](https://towardsdatascience.com/10-common-software-architectural-patterns-in-a-nutshell-a0b47a1e9013)
 	* [How NOT to design Netflix in your 45-minute System Design Interview?](https://hackernoon.com/how-not-to-design-netflix-in-your-45-minute-system-design-interview-64953391a054)
-* [Explaining Low-Level Systems (OS, Network/Protocol, Storage, etc)](https://www.palantir.com/how-to-ace-a-systems-design-interview/)	
+* [Explaining Low-Level Systems (OS, Network/Protocol, Database, Storage)](https://www.palantir.com/how-to-ace-a-systems-design-interview/)	
 	* [OSI and TCP/IP Cheat Sheet (Short but Sweet)](http://jaredheinrichs.com/mastering-the-osi-tcpip-models.html)
 	* [The Precise Meaning of I/O Wait Time in Linux](http://veithen.github.io/2013/11/18/iowait-linux.html)
 	* [Paxos Made Live – An Engineering Perspective](https://research.google.com/archive/paxos_made_live.html)
 	* [How to do Distributed Locking](https://martin.kleppmann.com/2016/02/08/how-to-do-distributed-locking.html)
+	* [SQL Transaction Isolation Levels Explained](http://elliot.land/post/sql-transaction-isolation-levels-explained)
 * ["What Happens When..." Questions](https://www.glassdoor.com/Interview/What-happens-when-you-type-www-google-com-in-your-browser-QTN_56396.htm)
 	* [What Happens When You Type google.com into Browser and Press Enter?](https://github.com/alex/what-happens-when)
 	* [Netflix: What Happens When You Press Play?](http://highscalability.com/blog/2017/12/11/netflix-what-happens-when-you-press-play.html)