diff --git a/README.md b/README.md
index c9c6164..c09be1f 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,7 @@ var textpath = new maptalks.TextPath(
 	 	textName: "test123456test123456test中文测试中文测试123456",
 		fontSize: '10000m',	// meter(m) use geoDistance, pixel(px) use pixelDistance
 		fontFamily: "Arial",
+		textStrokeMin: 8,			// no text drawed if text-pixel-Size < textStrokeMin, default 5
 		symbol:{
 			'lineColor' : 'red',
 			'lineOpacity': 0.9