diff --git a/README.md b/README.md
index b68e3f66..8e1ec37e 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # react-native-baidu-map [![npm version](https://img.shields.io/npm/v/react-native-baidu-map.svg?style=flat)](https://www.npmjs.com/package/react-native-baidu-map)
 
-Baidu Map SDK modules and view for React Native, support react native 0.30+
+Baidu Map SDK modules and view for React Native(Android & IOS), support react native 0.30+
 
 百度地图 React Native 模块，支持 react native 0.30+
 
diff --git a/ios/RCTBaiduMap/RCTBaiduMapView.m b/ios/RCTBaiduMap/RCTBaiduMapView.m
index 48c62ac0..4c561960 100644
--- a/ios/RCTBaiduMap/RCTBaiduMapView.m
+++ b/ios/RCTBaiduMap/RCTBaiduMapView.m
@@ -74,7 +74,6 @@ -(void)setMarkers:(NSArray *)markers {
                 BMKPointAnnotation *annotation = [_annotations objectAtIndex:i];
                 [self removeAnnotation:annotation];
                 [_annotations removeObject:annotation];
-                annotation = nil;
             }
         }
         
diff --git a/package.json b/package.json
index 91338a35..dc279550 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "react-native-baidu-map",
-  "version": "0.4.2",
-  "description": "Baidu Map SDK For React Native, Support both Android and IOS.",
+  "version": "0.4.3",
+  "description": "Baidu Map SDK modules and view for React Native(Android & IOS), support react native 0.30+.",
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"