diff --git a/README.md b/README.md
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@@ -27,7 +27,8 @@ Contributions are always welcome!
 * [CAP Theorem and Trade-offs](http://robertgreiner.com/2014/08/cap-theorem-revisited/)	
 * [Scaling Up and Scaling Out](https://blogs.technet.microsoft.com/admoore/2015/02/17/scaling-out-vs-scaling-up/)
 * [ACID and BASE](https://neo4j.com/blog/acid-vs-base-consistency-models-explained/)
-* [Synchronous and Asynchronous](https://blogs.msdn.microsoft.com/csliu/2009/08/04/inside-scalable-io-model-in-sync-async-way/)
+* [Blocking/Non-Blocking and Sync/Async](https://blogs.msdn.microsoft.com/csliu/2009/08/27/io-concept-blockingnon-blocking-vs-syncasync/)
+* [Why Non-Blocking?](https://techblog.bozho.net/why-non-blocking/)
 * [SQL and NoSQL](https://www.upwork.com/hiring/data/sql-vs-nosql-databases-whats-the-difference/)
 * [Consistent Hashing - Explained by Tom White, author of 'Hadoop: the Definitive Guide'](http://www.tom-e-white.com/2007/11/consistent-hashing.html)
 * [Cache is King!](https://www.stevesouders.com/blog/2012/10/11/cache-is-king/)