diff --git a/lxd/instance/drivers/driver_lxc.go b/lxd/instance/drivers/driver_lxc.go
index <HASH>..<HASH> 100644
--- a/lxd/instance/drivers/driver_lxc.go
+++ b/lxd/instance/drivers/driver_lxc.go
@@ -5493,7 +5493,7 @@ func (d *lxc) FileSFTPConn() (net.Conn, error) {
 		return forkfileConn, nil
 	}
 
-	// Check for ongoing operations (that may involve shifting).
+	// Check for ongoing operations (that may involve shifting or replacing the root volume).
 	_ = operationlock.Get(d.Project(), d.Name()).Wait()
 
 	// Setup reverter.
lxd/instance/drivers/driver/lxc: Improve comment in FileSFTPConn