diff --git a/4-3-NOSQL.md b/4-3-NOSQL.md
index 84deae7..a04b10d 100644
--- a/4-3-NOSQL.md
+++ b/4-3-NOSQL.md
@@ -232,7 +232,10 @@
           capacity
 - Clustering:
     - Multiple nodes, each one of them has different keys
-    - Servers are not aware there are multiple of them (transparent)
+    - Servers are not aware there are multiple of them (transparent): **Smart
+      Clients & Dumb Servers**
+        - Client has function that maps keys to servers, while
+        - Servers are not aware there are multiple of them
 
 #### Cassandra