diff --git a/README.MD b/README.MD
index 4f3003d..3013117 100644
--- a/README.MD
+++ b/README.MD
@@ -5,9 +5,9 @@ import Stepper
from machine import Pin
s1 = Stepper.create(Pin(16,Pin.OUT),Pin(17,Pin.OUT),Pin(5,Pin.OUT),Pin(18,Pin.OUT), delay=2)
s1.step(100)
-s1.step(100,-1)
+s1.step(100,-1) # or s1.step(-100)
s1.angle(180)
-s1.angle(360,-1)
+s1.angle(360,-1) # or s1.angle(-360)
```
function `angle` is angle, and the PIN map:
`IN1` link `PIN_16`
@@ -15,4 +15,4 @@ function `angle` is angle, and the PIN map:
`IN3` link `PIN_5`
`IN4` link `PIN_18`
My uln2003 board like this, and stepper runing:
-![uln2003](img/uln2003.jpg) ![uln2003](img/stepper.gif)
\ No newline at end of file
+![uln2003](img/uln2003.jpg) ![uln2003](img/stepper.gif)