diff --git a/config/gitlab.yml.example b/config/gitlab.yml.example
index 20b1020e025..6dcaefc05d5 100644
--- a/config/gitlab.yml.example
+++ b/config/gitlab.yml.example
@@ -431,6 +431,7 @@ production: &base
     # key: config/registry.key
     # path: shared/registry
     # issuer: gitlab-issuer
+    # notification_secret: '' # only set it when you use Geo replication feature without built-in Registry
 
     # Add notification settings if you plan to use Geo Replication for the registry
     # notifications: