diff --git a/weed/shell/command_volume_vacuum_disable.go b/weed/shell/command_volume_vacuum_disable.go
index e285117c9..ddae744e5 100644
--- a/weed/shell/command_volume_vacuum_disable.go
+++ b/weed/shell/command_volume_vacuum_disable.go
@@ -19,7 +19,7 @@ func (c *commandDisableVacuum) Name() string {
 }
 
 func (c *commandDisableVacuum) Help() string {
-	return `disable vacuuming
+	return `disable vacuuming request from Master, however volume.vacuum still works.
 
 	volume.vacuum.disable
 
diff --git a/weed/shell/command_volume_vacuum_enable.go b/weed/shell/command_volume_vacuum_enable.go
index ae25c9433..03284c92f 100644
--- a/weed/shell/command_volume_vacuum_enable.go
+++ b/weed/shell/command_volume_vacuum_enable.go
@@ -19,7 +19,7 @@ func (c *commandEnableVacuum) Name() string {
 }
 
 func (c *commandEnableVacuum) Help() string {
-	return `enable vacuuming
+	return `enable vacuuming request from Master
 
 	volume.vacuum.enable