diff --git a/docs/06-data-encryption-keys.md b/docs/06-data-encryption-keys.md
index 37f3d09..bcf5eb8 100644
--- a/docs/06-data-encryption-keys.md
+++ b/docs/06-data-encryption-keys.md
@@ -4,6 +4,9 @@ Kubernetes stores a variety of data including cluster state, application configu
 
 In this chapter, you will generate an encryption key and an [encryption config](https://kubernetes.io/docs/tasks/administer-cluster/encrypt-data/#understanding-the-encryption-at-rest-configuration) suitable for encrypting Kubernetes Secrets.
 
+**All procedures in this chapter should be done in `client-1`.**
+
+
 ## The Encryption Key
 
 Generate an encryption key: