diff --git a/tool/ls/ls.go b/tool/ls/ls.go
index 132d3a9..943e83a 100644
--- a/tool/ls/ls.go
+++ b/tool/ls/ls.go
@@ -126,17 +126,24 @@ ls(p string, fold int) error {
 
 func Run(flagSet *mtool.Flags) {
 	var foldLvl int
-	flagSet.IntVar(&foldLvl, "r", 1, "List recursively with choosing deepness, can't be negative or zero.")
-	flagSet.BoolVar(&listHidden, "a", false, "List hidden files.")
+	var rFlag bool
+	flagSet.BoolVar(&rFlag, "R", false, "set the '-r' flags value to the max depth (overrides the '-r')")
+	flagSet.IntVar(&foldLvl, "r", 1, "list recursively with choosing deepness, can't be negative or zero.")
+	flagSet.BoolVar(&listHidden, "a", false, "list hidden files.")
 	flagSet.Parse()
 	args = flagSet.Args()
 
+	if rFlag {
+		foldLvl = 9999999
+	}
 	if foldLvl<0 {
 		flagSet.Usage()
+		os.Exit(1)
 	}
 
 	if foldLvl==0 && len(args)==0 {
 		flagSet.Usage()
+		os.Exit(1)
 	}
 	
 	if len(args) == 0 {