diff --git a/README.md b/README.md
index 6e29fd4..192b699 100644
--- a/README.md
+++ b/README.md
@@ -6,14 +6,14 @@ This is the clinet librray of HOYA Voice Text Web API for .NET.
 Istllation
 ----------
 
-You can install via nuget.org **with pre-release switch.**
+You can install via nuget.org
 
-    PM> Install-Package VoiceTextWebAPI.Client -pre
+    PM> Install-Package VoiceTextWebAPI.Client
 
 Usage
 -----
 
-```CSharp
+```csharp
 using VoiceTextWebAPI.Client;
 ...
 public async void btn_OnClick()
@@ -26,7 +26,8 @@ public async void btn_OnClick()
     EmotionLevel = EmotionLevel.High,
     Volume = 50,
     Speed = 120,
-    Pitch = 120
+    Pitch = 120,
+    Format = Format.WAV
   };
   var bytes = await client.GetVoiceAsync("こんにちは。");
   File.WriteAllBytes(".\\result.wav", bytes);
@@ -35,4 +36,4 @@ public async void btn_OnClick()
 
 License
 -------
-Copyright (c) 2014 @jsakamoto. Licensed under the MIT license.
\ No newline at end of file
+Copyright (c) 2014 @jsakamoto. Licensed under the MIT license.
diff --git a/VoiceTextWebAPI.Client/Format.cs b/VoiceTextWebAPI.Client/Format.cs
new file mode 100644
index 0000000..1602f38
--- /dev/null
+++ b/VoiceTextWebAPI.Client/Format.cs
@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace VoiceTextWebAPI.Client
+{
+    public enum Format
+    {
+        WAV,
+        OGG,
+        AAC
+    }
+}
diff --git a/VoiceTextWebAPI.Client/Properties/AssemblyInfo.cs b/VoiceTextWebAPI.Client/Properties/AssemblyInfo.cs
index c06e53c..a6e4603 100644
--- a/VoiceTextWebAPI.Client/Properties/AssemblyInfo.cs
+++ b/VoiceTextWebAPI.Client/Properties/AssemblyInfo.cs
@@ -10,7 +10,7 @@
 [assembly: AssemblyConfiguration("")]
 [assembly: AssemblyCompany("")]
 [assembly: AssemblyProduct(".NET Client for VoiceText Web API")]
-[assembly: AssemblyCopyright("Copyright © J.Sakamoto 2014, MIT License")]
+[assembly: AssemblyCopyright("Copyright © J.Sakamoto 2014-2015, MIT License")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
 
@@ -32,4 +32,4 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.2.0.0")]
+[assembly: AssemblyVersion("1.3.0.1")]
diff --git a/VoiceTextWebAPI.Client/VoiceTextClient.cs b/VoiceTextWebAPI.Client/VoiceTextClient.cs
index 21eb873..2336b1a 100644
--- a/VoiceTextWebAPI.Client/VoiceTextClient.cs
+++ b/VoiceTextWebAPI.Client/VoiceTextClient.cs
@@ -23,6 +23,8 @@ public class VoiceTextClient
 
         public int Volume { get; set; }
 
+        public Format Format { get; set; }
+
         public string APIKey { get; set; }
 
         public Uri APIEndPoint { get; set; }
@@ -36,6 +38,7 @@ public VoiceTextClient()
             this.Pitch = 100;
             this.Speed = 100;
             this.Volume = 100;
+            this.Format = Format.WAV;
         }
 
         public byte[] GetVoice(string text)
@@ -80,6 +83,7 @@ private FormUrlEncodedContent BuildHttpRequestContent(string text)
                 {"pitch", this.Pitch.ToString()},
                 {"speed", this.Speed.ToString()},
                 {"volume", this.Volume.ToString()},
+                {"format", this.Format.ToString().ToLower()},
             };
             if (this.Emotion != Emotion.Default)
             {
diff --git a/VoiceTextWebAPI.Client/VoiceTextWebAPI.Client.csproj b/VoiceTextWebAPI.Client/VoiceTextWebAPI.Client.csproj
index cd48861..8915598 100644
--- a/VoiceTextWebAPI.Client/VoiceTextWebAPI.Client.csproj
+++ b/VoiceTextWebAPI.Client/VoiceTextWebAPI.Client.csproj
@@ -46,6 +46,7 @@
   <ItemGroup>
     <Compile Include="Emotion.cs" />
     <Compile Include="EmotionLevel.cs" />
+    <Compile Include="Format.cs" />
     <Compile Include="Speaker.cs" />
     <Compile Include="VoiceTextClient.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
diff --git a/VoiceTextWebAPI.Client/VoiceTextWebAPI.Client.nuspec b/VoiceTextWebAPI.Client/VoiceTextWebAPI.Client.nuspec
index af88646..188eacf 100644
--- a/VoiceTextWebAPI.Client/VoiceTextWebAPI.Client.nuspec
+++ b/VoiceTextWebAPI.Client/VoiceTextWebAPI.Client.nuspec
@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>$id$</id>
-    <version>$version$-beta</version>
+    <version>$version$</version>
     <title>$title$</title>
     <authors>J.Sakamoto</authors>
     <owners>J.Sakamoto</owners>
@@ -18,6 +18,8 @@
     </description>
     <releaseNotes>
       <![CDATA[
+      v.1.3
+      - Can chose voice file format from wav/ogg/aac.
       v.1.2
       - Add speaker "Bear"(Berserk Bear)!
       v.1.1