diff --git a/src/main/java/com/sinch/xms/api/MediaBody.java b/src/main/java/com/sinch/xms/api/MediaBody.java
index ebb6ec0..ce30ae1 100644
--- a/src/main/java/com/sinch/xms/api/MediaBody.java
+++ b/src/main/java/com/sinch/xms/api/MediaBody.java
@@ -61,6 +61,14 @@ public static final MediaBody.Builder builder() {
     return new MediaBody.Builder();
   }
 
+  /**
+   * The subject of the message.
+   *
+   * @return a subject
+   */
+  @Nullable
+  public abstract String subject();
+
   /**
    * The text message.
    *
diff --git a/src/main/java/com/sinch/xms/api/MtBatchMmsResult.java b/src/main/java/com/sinch/xms/api/MtBatchMmsResult.java
index cf1fc63..b960a91 100644
--- a/src/main/java/com/sinch/xms/api/MtBatchMmsResult.java
+++ b/src/main/java/com/sinch/xms/api/MtBatchMmsResult.java
@@ -56,8 +56,9 @@ public static final MtBatchMmsResult.Builder builder() {
   }
 
   /**
-   * The message body including message text or template (optional) and the media content url. If
-   * this describes a template then {@link #parameters()} describes the parameter substitutions.
+   * The message body including message text or template and/or subject (optional) and the media
+   * content url. If this describes a template then {@link #parameters()} describes the parameter
+   * substitutions.
    *
    * <p>See {@link MtBatchMmsCreate#body()} for a more thorough description of this field.
    *
diff --git a/src/test/java/com/sinch/xms/api/MtBatchMmsCreateTest.java b/src/test/java/com/sinch/xms/api/MtBatchMmsCreateTest.java
index 8d74436..fbedaf3 100644
--- a/src/test/java/com/sinch/xms/api/MtBatchMmsCreateTest.java
+++ b/src/test/java/com/sinch/xms/api/MtBatchMmsCreateTest.java
@@ -117,6 +117,58 @@ public void canDeserializeWithMessageContent() throws Exception {
     assertThat(actual, is(expected));
   }
 
+  @Test
+  public void canSerializeWithSubject() throws Exception {
+    MtBatchMmsCreate input =
+        SinchSMSApi.batchMms()
+            .sender("1234")
+            .addRecipient("987654321")
+            .body(
+                SinchSMSApi.mediaBody()
+                    .url("http://my.test.url/image.jpg")
+                    .subject("the text")
+                    .build())
+            .build();
+
+    String expected =
+        Utils.join(
+                "\n",
+                "{",
+                "  'type': 'mt_media',",
+                "  'from': '1234',",
+                "  'to': [ '987654321' ],",
+                "  'body': {",
+                "    'url':'http://my.test.url/image.jpg',",
+                "    'subject':'the text'",
+                "  }",
+                "}")
+            .replace('\'', '"');
+
+    String actual = json.writeValueAsString(input);
+
+    assertThat(actual, is(TestUtils.jsonEqualTo(expected)));
+  }
+
+  @Test
+  public void canDeserializeWithSubject() throws Exception {
+    MtBatchMmsCreate expected =
+        SinchSMSApi.batchMms()
+            .sender("1234")
+            .addRecipient("987654321")
+            .body(
+                SinchSMSApi.mediaBody()
+                    .url("http://my.test.url/image.jpg")
+                    .subject("the text")
+                    .build())
+            .build();
+
+    String input = json.writeValueAsString(expected);
+
+    MtBatchMmsCreate actual = json.readValue(input, MtBatchMmsCreate.class);
+
+    assertThat(actual, is(expected));
+  }
+
   @Test(expected = IllegalStateException.class)
   public void requiresUrl() {
     SinchSMSApi.batchMms()
diff --git a/src/test/java/com/sinch/xms/api/MtBatchMmsResultTest.java b/src/test/java/com/sinch/xms/api/MtBatchMmsResultTest.java
index b5566f4..ff33137 100644
--- a/src/test/java/com/sinch/xms/api/MtBatchMmsResultTest.java
+++ b/src/test/java/com/sinch/xms/api/MtBatchMmsResultTest.java
@@ -77,6 +77,7 @@ public void canSerializeWithParameters() throws Exception {
                 SinchSMSApi.mediaBody()
                     .url("http://my.test.url/image.jpg")
                     .message("the text")
+                    .subject("subject text")
                     .build())
             .putParameter(
                 "param1",
@@ -95,6 +96,7 @@ public void canSerializeWithParameters() throws Exception {
                 "  'to': [ '987654321' ],",
                 "  'body': {",
                 "    'url':'http://my.test.url/image.jpg',",
+                "    'subject':'subject text',",
                 "    'message':'the text'",
                 "  },",
                 "  'canceled': false,",
diff --git a/src/test/java/com/sinch/xms/api/MtBatchMmsUpdateTest.java b/src/test/java/com/sinch/xms/api/MtBatchMmsUpdateTest.java
index 6a8966f..c346479 100644
--- a/src/test/java/com/sinch/xms/api/MtBatchMmsUpdateTest.java
+++ b/src/test/java/com/sinch/xms/api/MtBatchMmsUpdateTest.java
@@ -60,6 +60,7 @@ public void canSerializeWithUpdatedParameters() throws Exception {
                 SinchSMSApi.mediaBody()
                     .url("http://my.test.url/image.jpg")
                     .message("the text")
+                    .subject("subject text")
                     .build())
             .parameters(UpdateValue.set(params))
             .build();
@@ -73,7 +74,8 @@ public void canSerializeWithUpdatedParameters() throws Exception {
                 "  'to_add': [ '987654321' ],",
                 "  'body': {",
                 "    'url':'http://my.test.url/image.jpg',",
-                "    'message':'the text'",
+                "    'message':'the text',",
+                "    'subject':'subject text'",
                 "  },",
                 "  'parameters': { 'newparam': { 'key1': 'value1' } }",
                 "}")