diff --git a/README.md b/README.md
index 218c1f4..d21b5d2 100644
--- a/README.md
+++ b/README.md
@@ -10,10 +10,10 @@ Create gesture events.
 
 ```blocks
 grove.onGesture(GroveGesture.Up, () => {
-    basic.showString("Up")
+    basic.showString("Up");
 })
 grove.onGesture(GroveGesture.Down, () => {
-    basic.showString("Down")
+    basic.showString("Down");
 })
 ```
 
@@ -22,15 +22,13 @@ grove.onGesture(GroveGesture.Down, () => {
 Measure distance in centimeters, specify the signal pin.
 
 ```blocks
-let distance = 0
-distance = grove.measureInCentimeters(DigitalPin.P0)
+let distance = grove.measureInCentimeters(DigitalPin.P0);
 ```
 
 Measure distance in inches, specify the signal pin.
 
 ```blocks
-let distance = 0
-distance = grove.measureInInches(DigitalPin.P0)
+let distance = grove.measureInInches(DigitalPin.P0);
 ```
 
 ### Grove - 4 digital display
@@ -38,16 +36,11 @@ distance = grove.measureInInches(DigitalPin.P0)
 Create a 4 Digital Display driver, specify the clk and data pin, and set the brightness level, then start display value.
 
 ```blocks
-let display: grove.TM1637 = null
-display = grove.createDisplay(DigitalPin.P0, DigitalPin.P1)
-display.set(7)
-display.show(1234)
+let display = grove.createDisplay(DigitalPin.P0, DigitalPin.P1);
+display.set(7);
+display.show(1234);
 ```
 
-## More operation
-
-### Grove - 4 digital display
-
 Use ``||bit||`` to display one bit number.
 
 Use ``||point||`` to open or close point dispay.