diff --git a/weed/command/compact.go b/weed/command/compact.go
index 6d1f5d5f1..6f5f2307a 100644
--- a/weed/command/compact.go
+++ b/weed/command/compact.go
@@ -28,7 +28,7 @@ var (
 	compactVolumePath        = cmdCompact.Flag.String("dir", ".", "data directory to store files")
 	compactVolumeCollection  = cmdCompact.Flag.String("collection", "", "volume collection name")
 	compactVolumeId          = cmdCompact.Flag.Int("volumeId", -1, "a volume id. The volume should already exist in the dir.")
-	compactMethod            = cmdCompact.Flag.Int("method", 0, "option to choose which compact method. use 0 or 1.")
+	compactMethod            = cmdCompact.Flag.Int("method", 0, "option to choose which compact method. use 0 (default) or 1.")
 	compactVolumePreallocate = cmdCompact.Flag.Int64("preallocateMB", 0, "preallocate volume disk space")
 )