diff --git a/Documentation/Books/Manual/SUMMARY.md b/Documentation/Books/Manual/SUMMARY.md
index aff44083aa..e0497ce744 100644
--- a/Documentation/Books/Manual/SUMMARY.md
+++ b/Documentation/Books/Manual/SUMMARY.md
@@ -18,6 +18,7 @@
   # * [Coming from MongoDB](GettingStarted/ComingFromMongoDb.md) #TODO
 #
 * [Scalability](Scalability/README.md)
+  * [Cluster](Scalability/Cluster.md)
 #  * [Joins](Scalability/Joins.md)
 #
 * [Data model & modeling](DataModeling/README.md)