diff --git a/README.md b/README.md
index 06b7b37..0d57e60 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,12 @@
-# Correo
\ No newline at end of file
+# Correo
+
+Correo is a .NET service with the role of programmatically sending emails.
+It can integrate with:
+
+**SMTP servers:**
+* local servers
+* Gmail
+* Yahoo
+
+**Transactional Email APIs:**
+* SendGrid
\ No newline at end of file
diff --git a/src/Correo/Controllers/SystemController.cs b/src/Correo/Controllers/SystemController.cs
index 7cedb54..0fe5966 100644
--- a/src/Correo/Controllers/SystemController.cs
+++ b/src/Correo/Controllers/SystemController.cs
@@ -1,4 +1,6 @@
 using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Logging;
+using System;
 
 namespace Correo.Controllers
 {
diff --git a/src/Correo/Correo.csproj b/src/Correo/Correo.csproj
index 60bf9ea..9da1712 100644
--- a/src/Correo/Correo.csproj
+++ b/src/Correo/Correo.csproj
@@ -2,8 +2,6 @@
 
   <PropertyGroup>
     <TargetFramework>net6.0</TargetFramework>
-    <Nullable>enable</Nullable>
-    <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/Correo/Program.cs b/src/Correo/Program.cs
index c77867f..07888f6 100644
--- a/src/Correo/Program.cs
+++ b/src/Correo/Program.cs
@@ -1,3 +1,7 @@
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+
 namespace Correo
 {
     public class Program