diff --git a/docs/docs/cloud/reference/env_var.md b/docs/docs/cloud/reference/env_var.md
index e82778248..099ee8b9d 100644
--- a/docs/docs/cloud/reference/env_var.md
+++ b/docs/docs/cloud/reference/env_var.md
@@ -98,3 +98,12 @@ Specify `REDIS_URI_CUSTOM` to use a custom Redis instance. The value of `REDIS_U
 Specify a prefix for Redis keys. This allows multiple LangGraph Server instances to share the same Redis instance by using different key prefixes. 
 
 Defaults to `''`.
+
+## `REDIS_CLUSTER`
+
+!!! info "Only for Self-Hosted Data Plane and Self-Hosted Control Plane"
+    Redis Cluster mode is only available for [Self-Hosted Data Plane](../../concepts/langgraph_self_hosted_data_plane.md) and [Self-Hosted Control Plane](../../concepts/langgraph_self_hosted_control_plane.md) deployments.
+
+Set `REDIS_CLUSTER` to `True` to enable Redis Cluster mode. When enabled, the system will connect to Redis using cluster mode. This is useful when connecting to a Redis Cluster deployment.
+
+Defaults to `False`.