diff --git a/weed/command/volume.go b/weed/command/volume.go
index 1b222f090..0a7d52049 100644
--- a/weed/command/volume.go
+++ b/weed/command/volume.go
@@ -90,7 +90,7 @@ var (
 	volumeFolders         = cmdVolume.Flag.String("dir", os.TempDir(), "directories to store data files. dir[,dir]...")
 	maxVolumeCounts       = cmdVolume.Flag.String("max", "8", "maximum numbers of volumes, count[,count]... If set to zero, the limit will be auto configured.")
 	volumeWhiteListOption = cmdVolume.Flag.String("whiteList", "", "comma separated Ip addresses having write permission. No limit if empty.")
-	minFreeSpacePercent   = cmdVolume.Flag.String("minFreeSpacePercent", "0", "minimum free disk space(in percents). Low disk space will mark all volumes as ReadOnly.")
+	minFreeSpacePercent   = cmdVolume.Flag.String("minFreeSpacePercent", "1", "minimum free disk space (default to 1%). Low disk space will mark all volumes as ReadOnly.")
 )
 
 func runVolume(cmd *Command, args []string) bool {