diff --git a/README.md b/README.md
index cf35ec7..808da2c 100644
--- a/README.md
+++ b/README.md
@@ -4,23 +4,25 @@
 **Reference:**
 https://github.com/Viglino/Canvas-TextPath
 
+##Demo Online
+
 ## Usage
 ```javascript
 var layer = new maptalks.VectorLayer('vector').addTo(map);
 var textpath = new maptalks.TextPath(
         [
-			map.getCenter().add(-0.1, -0.2),
-			map.getCenter().add(0.1, 0.1),
-			map.getCenter().add(-0.1, 0.1)
+		map.getCenter().add(-0.1, -0.2),
+		map.getCenter().add(0.1, 0.1),
+		map.getCenter().add(-0.1, 0.1)
         ],
         {
-		  fontSize: '10000m',	// meter(m) use geoDistance, pixel(px) use pixelDistance
-		  text: "test123456test123456test123456test123456test123456",
-		  fontFamily: "Arial",
-          symbol:{
-            'lineColor' : 'red',
+		fontSize: '10000m',	// meter(m) use geoDistance, pixel(px) use pixelDistance
+		text: "test123456test123456test123456test123456test123456",
+		fontFamily: "Arial",
+		symbol:{
+		'lineColor' : 'red',
 			      'lineOpacity': 0.9
-          }
+		}
         }
       ).addTo(layer);
 ```