diff --git a/robotgo.go b/robotgo.go
index 065561e..724b4c2 100644
--- a/robotgo.go
+++ b/robotgo.go
@@ -112,8 +112,13 @@ func Try(fun func(), handler func(interface{})) {
 	fun()
 }
 
-// Sleep time.Sleep
-func Sleep(tm float64) {
+// MilliSleep sleep tm milli second
+func MilliSleep(tm int) {
+	time.Sleep(time.Duration(tm) * time.Millisecond)
+}
+
+// Sleep time.Sleep tm second
+func Sleep(tm int) {
 	time.Sleep(time.Duration(tm) * time.Second)
 }