diff --git a/docs/VOLUMES.md b/docs/VOLUMES.md
index e1c6f28..f1b01d3 100644
--- a/docs/VOLUMES.md
+++ b/docs/VOLUMES.md
@@ -33,7 +33,7 @@ make volume-rm-service NAMESPACE=yourproject SERVICE=storage
 
 ## Volume backup (service)
 
-Backup a volume by `NAMESPACE` and `SERVICE`.
+Backup a volume by `NAMESPACE` and `SERVICE` at the `./backup` directory.
 
 ```sh
 make volume-backup-service NAMESPACE=yourproject SERVICE=database
@@ -42,7 +42,7 @@ make volume-backup-service NAMESPACE=yourproject SERVICE=storage
 
 ## Volume restore (service)
 
-Restore a volume by `NAMESPACE` and `SERVICE`.
+Restore a volume by `NAMESPACE` and `SERVICE` at the `./backup` directory.
 
 ```sh
 make volume-restore-service NAMESPACE=yourproject SERVICE=database