diff --git a/distributed_systems/README.md b/distributed_systems/README.md
index 06cb2f2..6e96e8c 100644
--- a/distributed_systems/README.md
+++ b/distributed_systems/README.md
@@ -4,6 +4,8 @@
 
 * [A simple totally ordered broadcast protocol](http://labs.yahoo.com/files/ladis08.pdf)
 
+* [Above the Clouds: A Berkeley View of Cloud Computing](http://www.eecs.berkeley.edu/Pubs/TechRpts/2009/EECS-2009-28.pdf)
+
 * [Cassandra - A Decentralized Structured Storage System](http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.161.6751&rep=rep1&type=pdf)
 
 * [Chord: A Scalable Peer-to-peer Lookup Service for Internet Applications](http://pdos.csail.mit.edu/papers/chord:sigcomm01/chord_sigcomm.pdf)