volume: auto expands -max setting

I have tried to run weed volume but got errors...
cmd:
weed volume -max=0 -mserver="127.0.0.1:9333" -port=8080 -dir="/var/www/d1/sfs,/var/www/d2/sfs,/var/www/d3/sfs"
log:
I1006 15:09:26 17040 file_util.go:23] Folder /var/www/d1/sfs Permission: -rwxr-xr-x
I1006 15:09:26 17040 file_util.go:23] Folder /var/www/d2/sfs Permission: -rwxr-xr-x
I1006 15:09:26 17040 file_util.go:23] Folder /var/www/d3/sfs Permission: -rwxr-xr-x
F1006 15:09:26 17040 volume.go:142] 3 directories by -dir, but only 1 max is set by -max
What am I doing wrong? Thx.

weed/command/volume.go

@@ -138,6 +138,11 @@ func (v VolumeServerOptions) startVolumeServer(volumeFolders, maxVolumeCounts, v
 			glog.Fatalf("The max specified in -max not a valid number %s", maxString)
 		}
 	}
+	if len(v.folderMaxLimits) == 1 && len(v.folders) > 1 {
+		for i := 0; i < len(v.folders)-1; i++ {
+			v.folderMaxLimits = append(v.folderMaxLimits, v.folderMaxLimits[0])
+		}
+	}
 	if len(v.folders) != len(v.folderMaxLimits) {
 		glog.Fatalf("%d directories by -dir, but only %d max is set by -max", len(v.folders), len(v.folderMaxLimits))
 	}