diff --git a/Path-Specific-Filer-Store.md b/Path-Specific-Filer-Store.md
index 483aa02..68a33b9 100644
--- a/Path-Specific-Filer-Store.md
+++ b/Path-Specific-Filer-Store.md
@@ -7,7 +7,7 @@ In most cases, you would just need to setup one filer store.
 However, there are some examples that one filer store is not enough:
 * The filer store that is not linearly scalable.
 * A portion of the data is critical and needs Etcd for strong consistency but acceptable low performance.
-* With too many updates in a directory, the Cassandra becomes slower with too many tombstones. You may want to use Redis for that directory.
+* With too many updates in a directory, the Cassandra with LSM tree becomes slower with too many tombstones. You may want to use Redis for that directory.
 
 # How to add path-specific filer stores?