diff --git a/crates/lavina-core/src/clustering/mod.rs b/crates/lavina-core/src/clustering/mod.rs
index 990f31a..5a7fb1d 100644
--- a/crates/lavina-core/src/clustering/mod.rs
+++ b/crates/lavina-core/src/clustering/mod.rs
@@ -18,6 +18,19 @@ use crate::prelude::Str;
 use crate::table::{AnonTable};
 use crate::terminator::Terminator;
 
+/*
+сценарии:
+- бутстрап нового кластера
+- подключение новой ноды к кластеру
+- вывод существующей ноды из кластера
+
+имплементация:
+- etcd для выбора лидера
+- определение модели данных
+- определение протокола общения между нодами
+- модель верификации поведения нод
+ */
+
 #[derive(Deserialize, Debug, Clone)]
 pub struct ClusteringConfig {
     /// The name of the cluster used for prefixing the data in etcd and to prevent accidental communication between different clusters.
diff --git a/docs/flow.md b/docs/flow.md
index ef83f3c..9ea88a7 100644
--- a/docs/flow.md
+++ b/docs/flow.md
@@ -65,3 +65,26 @@ C4Context
     BiRel(BobPC, BobConn1, "IRC")
     UpdateLayoutConfig($c4ShapeInRow="3", $c4BoundaryInRow="1")
 ```
+
+## Cluster
+
+```mermaid
+C4Context
+    System_Ext(Alice, "Alice IRC")
+    System_Ext(Bob, "Bob XMPP")
+    Boundary(Lavina, "Lavina", "Cluster of nodes") {
+        System(Node1, "Node 1", "Single server process")
+        System(Node2, "Node 2", "Single server process")
+        System(Node3, "Node 3", "Single server process")
+        Rel(Node1, etcd, "")
+        Rel(Node2, etcd, "")
+        Rel(Node3, etcd, "")
+        BiRel(Node1, Node2, "")
+        BiRel(Node2, Node3, "")
+        BiRel(Node1, Node3, "")
+        System(etcd, "etcd", "Key-value store")
+        UpdateLayoutConfig($c4ShapeInRow="2", $c4BoundaryInRow="1")
+    }
+    Rel(Alice, Node1, "")
+    Rel(Bob, Node2, "")
+```
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