diff --git a/datastores/README.md b/datastores/README.md
index 22934c2..746b9d2 100644
--- a/datastores/README.md
+++ b/datastores/README.md
@@ -1 +1,2 @@
 * [Calvin: Fast Distributed Transactions for Partitioned Database Systems](http://cs.yale.edu/homes/thomson/publications/calvin-sigmod12.pdf)
+* [f4: Facebook’s Warm BLOB Storage System](http://www-bcf.usc.edu/~wyattllo/papers/f4-osdi14.pdf)