diff --git a/user/advanced-configuration/secondary-storage.md b/user/advanced-configuration/secondary-storage.md
index c5fd4248..3fbf22b1 100644
--- a/user/advanced-configuration/secondary-storage.md
+++ b/user/advanced-configuration/secondary-storage.md
@@ -64,6 +64,7 @@ Theses steps assume you have already created a separate Btrfs filesystem for you
 It is possible to use already available Btrfs storage if it is configured. In dom0, available Btrfs storage can be displayed using :
 ```shell_session
 mount -t btrfs
+btrfs show filesystem
 ```
 To register the storage to qubes :