diff --git a/Kawazu-Cli/Kawazu-Cli.csproj b/Kawazu-Cli/Kawazu-Cli.csproj
index 3116562..adb2730 100644
--- a/Kawazu-Cli/Kawazu-Cli.csproj
+++ b/Kawazu-Cli/Kawazu-Cli.csproj
@@ -2,9 +2,9 @@
 
     <PropertyGroup>
         <OutputType>Exe</OutputType>
-        <TargetFramework>netcoreapp3.1</TargetFramework>
         <RootNamespace>Kawazu</RootNamespace>
-        <LangVersion>8</LangVersion>
+        <LangVersion>9</LangVersion>
+        <TargetFrameworks>net5.0;netcoreapp3.1</TargetFrameworks>
     </PropertyGroup>
 
     <ItemGroup>
diff --git a/Kawazu/Kawazu.csproj b/Kawazu/Kawazu.csproj
index 9215578..4831c3e 100644
--- a/Kawazu/Kawazu.csproj
+++ b/Kawazu/Kawazu.csproj
@@ -1,5 +1,4 @@
 <Project Sdk="Microsoft.NET.Sdk">
-
     <PropertyGroup>
         <PackageId>Kawazu</PackageId>
         <Title>Kawazu</Title>
@@ -22,5 +21,4 @@
       <PackageReference Include="LibNMeCab.IpaDicBin" Version="0.10.0" />
         <None Include="Kawazu_icon.png" Pack="true" PackagePath="" />
     </ItemGroup>
-
 </Project>
diff --git a/Kawazu/KawazuConverter.cs b/Kawazu/KawazuConverter.cs
index c8e9091..ccd55e2 100644
--- a/Kawazu/KawazuConverter.cs
+++ b/Kawazu/KawazuConverter.cs
@@ -9,7 +9,7 @@ namespace Kawazu
 {
     
     /// <summary>
-    /// The main class of Kawazu library.
+    /// The main class of Kawazu library. Please call Dispose when finish using it or use the Using statement
     /// </summary>
     public class KawazuConverter: IDisposable
     {