diff --git a/client-libraries/java/rest-client/src/com/google/android/gcm/server/Constants.java b/client-libraries/java/rest-client/src/com/google/android/gcm/server/Constants.java
index a499e78..357f7cc 100644
--- a/client-libraries/java/rest-client/src/com/google/android/gcm/server/Constants.java
+++ b/client-libraries/java/rest-client/src/com/google/android/gcm/server/Constants.java
@@ -77,6 +77,11 @@ public final class Constants {
    */
   public static final String PARAM_PRIORITY = "priority";
 
+  /**
+   * Parameter used to set the content available (iOS only)
+   */
+  public static final String PARAM_CONTENT_AVAILABLE = "content_available";
+
   /**
    * Value used to set message priority to normal.
    */
diff --git a/client-libraries/java/rest-client/src/com/google/android/gcm/server/Message.java b/client-libraries/java/rest-client/src/com/google/android/gcm/server/Message.java
index d9f6fd7..99012c1 100644
--- a/client-libraries/java/rest-client/src/com/google/android/gcm/server/Message.java
+++ b/client-libraries/java/rest-client/src/com/google/android/gcm/server/Message.java
@@ -66,8 +66,10 @@ public final class Message implements Serializable {
   private final Boolean dryRun;
   private final String restrictedPackageName;
   private final String priority;
+  private final Boolean contentAvailable;
   private final Notification notification;
 
+
   public enum Priority {
     NORMAL, HIGH
   }
@@ -83,6 +85,7 @@ public static final class Builder {
     private Boolean dryRun;
     private String restrictedPackageName;
     private String priority;
+    private Boolean contentAvailable;
     private Notification notification;
 
     public Builder() {
@@ -160,6 +163,14 @@ public Builder notification(Notification value) {
       return this;
     }
 
+    /**
+     * Sets the contentAvailable property
+     */
+    public Builder contentAvailable(Boolean value){
+        contentAvailable = value;
+        return this;
+    }
+
     public Message build() {
       return new Message(this);
     }
@@ -174,6 +185,7 @@ private Message(Builder builder) {
     dryRun = builder.dryRun;
     restrictedPackageName = builder.restrictedPackageName;
     priority = builder.priority;
+    contentAvailable = builder.contentAvailable;
     notification = builder.notification;
   }
 
@@ -219,6 +231,13 @@ public String getPriority() {
     return priority;
   }
 
+  /**
+   * Gets the contentAvailable value
+   */
+  public Boolean getContentAvailable() {
+      return contentAvailable;
+  }
+
   /**
    * Gets the payload data, which is immutable.
    */
@@ -239,6 +258,9 @@ public String toString() {
     if (priority != null) {
       builder.append("priority=").append(priority).append(", ");
     }
+    if (contentAvailable != null){
+        builder.append("contentAvailable=").append(contentAvailable).append(", ");
+    }
     if (collapseKey != null) {
       builder.append("collapseKey=").append(collapseKey).append(", ");
     }
diff --git a/client-libraries/java/rest-client/src/com/google/android/gcm/server/Sender.java b/client-libraries/java/rest-client/src/com/google/android/gcm/server/Sender.java
index 59713e4..25b1f3b 100644
--- a/client-libraries/java/rest-client/src/com/google/android/gcm/server/Sender.java
+++ b/client-libraries/java/rest-client/src/com/google/android/gcm/server/Sender.java
@@ -43,6 +43,7 @@
 import static com.google.android.gcm.server.Constants.PARAM_DELAY_WHILE_IDLE;
 import static com.google.android.gcm.server.Constants.PARAM_DRY_RUN;
 import static com.google.android.gcm.server.Constants.PARAM_PRIORITY;
+import static com.google.android.gcm.server.Constants.PARAM_CONTENT_AVAILABLE;
 import static com.google.android.gcm.server.Constants.PARAM_RESTRICTED_PACKAGE_NAME;
 import static com.google.android.gcm.server.Constants.PARAM_TIME_TO_LIVE;
 import static com.google.android.gcm.server.Constants.TOKEN_CANONICAL_REG_ID;
@@ -456,6 +457,7 @@ private void messageToMap(Message message, Map<Object, Object> mapRequest) {
       return;
     }
     setJsonField(mapRequest, PARAM_PRIORITY, message.getPriority());
+    setJsonField(mapRequest, PARAM_CONTENT_AVAILABLE, message.getContentAvailable());
     setJsonField(mapRequest, PARAM_TIME_TO_LIVE, message.getTimeToLive());
     setJsonField(mapRequest, PARAM_COLLAPSE_KEY, message.getCollapseKey());
     setJsonField(mapRequest, PARAM_RESTRICTED_PACKAGE_NAME, message.getRestrictedPackageName());
diff --git a/client-libraries/java/rest-client/test/com/google/android/gcm/server/MessageTest.java b/client-libraries/java/rest-client/test/com/google/android/gcm/server/MessageTest.java
index 53ff13d..b4e2ac7 100644
--- a/client-libraries/java/rest-client/test/com/google/android/gcm/server/MessageTest.java
+++ b/client-libraries/java/rest-client/test/com/google/android/gcm/server/MessageTest.java
@@ -48,6 +48,7 @@ public void testRequiredParameters() {
   public void testOptionalParameters() {
     Message message = new Message.Builder()
         .priority(Message.Priority.HIGH)
+        .contentAvailable(true)
         .collapseKey("108")
         .delayWhileIdle(true)
         .timeToLive(42)
@@ -59,6 +60,7 @@ public void testOptionalParameters() {
         .notification(new Notification.Builder("my").build())
         .build();
     assertEquals("high", message.getPriority());
+    assertTrue(message.getContentAvailable());
     assertEquals("108", message.getCollapseKey());
     assertTrue(message.isDelayWhileIdle());
     assertEquals(42, message.getTimeToLive().intValue());
@@ -70,6 +72,7 @@ public void testOptionalParameters() {
     assertEquals("v2", data.get("k2"));
     String toString = message.toString();
     assertTrue(toString.contains("priority=high"));
+    assertTrue(toString.contains("contentAvailable=true"));
     assertTrue(toString.contains("collapseKey=108"));
     assertTrue(toString.contains("timeToLive=42"));
     assertTrue(toString.contains("delayWhileIdle=true"));