diff --git a/docs/deployment/clustering.md b/docs/deployment/clustering.md
index c559ebe59..38592366c 100644
--- a/docs/deployment/clustering.md
+++ b/docs/deployment/clustering.md
@@ -1,6 +1,6 @@
 # Clustering
 
-If you plan to run several Livebook instances behind a load balancer, you need to enable clustering via the `LIVEBOOK_CLUSTER` environment variable. `LIVEBOOK_DISTRIBUTION` is automatically set to `name` if clustering is enabled.
+If you plan to run several Livebook instances behind a load balancer, you need to enable clustering via the `LIVEBOOK_CLUSTER` environment variable in your Docker image. `LIVEBOOK_DISTRIBUTION` is automatically set to `name` if clustering is enabled.
 
 Depending on the clustering strategy of your choice, you must set additional environment variables, oftentimes, at runtime. When using the Livebook Docker image, you can create a file at `/app/user/env.sh` that exports the necessary environment variables. This file is invoked right before booting Livebook.