diff --git a/weed/shell/command_volume_check_disk.go b/weed/shell/command_volume_check_disk.go
index 837f0b8c5..3a51cdcce 100644
--- a/weed/shell/command_volume_check_disk.go
+++ b/weed/shell/command_volume_check_disk.go
@@ -27,7 +27,7 @@ func (c *commandVolumeCheckDisk) Name() string {
 }
 
 func (c *commandVolumeCheckDisk) Help() string {
-	return `check all replicated volumes to find and fix inconsistencies
+	return `check all replicated volumes to find and fix inconsistencies. It is optional and resource intensive.
 
 	How it works: