diff --git a/README.md b/README.md
index 00d10486..70ccabde 100644
--- a/README.md
+++ b/README.md
@@ -18,13 +18,13 @@
 ## 安装
 
 ### maven 方式
-将下边的依赖条件放到你项目的 maven pom.xml 文件里。
+将下边的依赖条件放到你项目的 maven pom.xml 文件里。v3.3.10 为例，最新版本请看[Release页面](https://github.com/jpush/jpush-api-java-client/releases)
 
 ```Java
 <dependency>
     <groupId>cn.jpush.api</groupId>
     <artifactId>jpush-client</artifactId>
-    <version>3.3.9</version>
+    <version>3.3.10</version>
 </dependency>
 ```
 ### jar 包方式
@@ -33,6 +33,7 @@
 
 
 ### 依赖包
+* [jiguang-java-client-common](https://github.com/jpush/jiguang-java-client-common) / 极光 Java client 的公共封装开发包，必须依赖，v1.1.4 为例，查看[最新版本](https://github.com/jpush/jiguang-java-client-common/releases)
 * [slf4j](http://www.slf4j.org/) / log4j (Logger)
 * [gson](https://code.google.com/p/google-gson/) (Google JSON Utils)
 
@@ -44,7 +45,7 @@
     <dependency>
         <groupId>cn.jpush.api</groupId>
         <artifactId>jiguang-common</artifactId>
-        <version>1.1.3</version>
+        <version>1.1.4</version>
     </dependency>
     <dependency>
         <groupId>io.netty</groupId>
diff --git a/pom.xml b/pom.xml
index 58fc4a1d..8269a102 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
 
 	<groupId>cn.jpush.api</groupId>
 	<artifactId>jpush-client</artifactId>
-	<version>3.3.10-SNAPSHOT</version>
+	<version>3.3.11-SNAPSHOT</version>
 	<packaging>jar</packaging>
 	<url>https://github.com/jpush/jpush-api-java-client</url>
 	<name>JPush API Java Client</name>
diff --git a/src/main/java/cn/jpush/api/push/model/Message.java b/src/main/java/cn/jpush/api/push/model/Message.java
index 4267d770..65e6c63d 100644
--- a/src/main/java/cn/jpush/api/push/model/Message.java
+++ b/src/main/java/cn/jpush/api/push/model/Message.java
@@ -60,7 +60,7 @@ public JsonElement toJSON() {
         }
         
         JsonObject extrasObject = null;
-        if (null != extras || null != numberExtras || null != booleanExtras) {
+        if (null != extras || null != numberExtras || null != booleanExtras || null != jsonExtras){
             extrasObject = new JsonObject();
         }
         
diff --git a/src/main/java/cn/jpush/api/push/model/notification/IosNotification.java b/src/main/java/cn/jpush/api/push/model/notification/IosNotification.java
index 95b27f96..c00c3b3e 100644
--- a/src/main/java/cn/jpush/api/push/model/notification/IosNotification.java
+++ b/src/main/java/cn/jpush/api/push/model/notification/IosNotification.java
@@ -17,6 +17,9 @@
  * <li>badge: 支持 setBadge(int) 方法来设置；支持 incrBadge(int) 方法来增加。</li>
  * <li>sound: 支持 setSound(string) 方法来设置声音文件。或者 setSound(JSON object) 对应官方payload结构 </li>
  * <li>content-available: 用来支持后台推送。如果该值赋值为 1，表示开启后台推送。</li>
+ * <li>mutable-content: 通知扩展</li>
+ * <li>category: IOS 8 才支持。设置 APNs payload 中的 "category" 字段值</li>
+ * <li>mutable-content: 通知扩展</li>
  * <li>extras: JSON object. 支持更多的自定义字段信息。</li>
  * </ul>
  * <br>
@@ -37,6 +40,7 @@ public class IosNotification extends PlatformNotification {
     private static final String CONTENT_AVAILABLE = "content-available";
     private static final String MUTABLE_CONTENT = "mutable-content";
     private static final String CATEGORY = "category";
+    private static final String THREAD_ID = "thread-id";
     
     private static final String ALERT_VALID_BADGE = "Badge number should be 0~99999, "
             + "and can be prefixed with + to add, - to minus";
@@ -49,11 +53,12 @@ public class IosNotification extends PlatformNotification {
     private final boolean contentAvailable;
     private final String category;
     private final boolean mutableContent;
+    private final String threadId;
 
     
     private IosNotification(Object alert, Object sound, String badge,
             boolean contentAvailable, boolean soundDisabled, boolean badgeDisabled, 
-            String category, boolean mutableContent,
+            String category, boolean mutableContent,String threadId,
             Map<String, String> extras, 
             Map<String, Number> numberExtras, 
             Map<String, Boolean> booleanExtras, 
@@ -67,6 +72,7 @@ private IosNotification(Object alert, Object sound, String badge,
         this.badgeDisabled = badgeDisabled;
         this.category = category;
         this.mutableContent = mutableContent;
+        this.threadId = threadId;
     }
     
     public static Builder newBuilder() {
@@ -115,6 +121,9 @@ public JsonElement toJSON() {
         if (mutableContent) {
             json.add(MUTABLE_CONTENT, new JsonPrimitive(true));
         }
+        if (null != threadId) {
+        	json.add(THREAD_ID, new JsonPrimitive(threadId));
+        }
 
         return json;
     }
@@ -128,6 +137,7 @@ public static class Builder extends PlatformNotification.Builder<IosNotification
         private boolean badgeDisabled = false;
         private String category;
         private boolean mutableContent;
+        private String threadId;
 
         protected Builder getThis() {
         	return this;
@@ -202,11 +212,16 @@ public Builder setMutableContent(boolean mutableContent) {
             this.mutableContent = mutableContent;
             return this;
         }
+        
+        public Builder setThreadId(String threadId) {
+        	this.threadId = threadId;
+        	return this;
+        }
 
 
         public IosNotification build() {
             return new IosNotification(alert, sound, badge, contentAvailable, 
-                    soundDisabled, badgeDisabled, category, mutableContent,
+                    soundDisabled, badgeDisabled, category, mutableContent, threadId,
             		extrasBuilder, numberExtrasBuilder, booleanExtrasBuilder, jsonExtrasBuilder);
         }
     }