diff --git a/Govor.API/Extensions/ConfigurationProgramExtensions.cs b/Govor.API/Extensions/ConfigurationProgramExtensions.cs
new file mode 100644
index 0000000..0a59251
--- /dev/null
+++ b/Govor.API/Extensions/ConfigurationProgramExtensions.cs
@@ -0,0 +1,57 @@
+using Govor.API.Services;
+using Govor.API.Services.AdminsStuff;
+using Govor.API.Services.AdminsStuff.Interfaces;
+using Govor.API.Services.Authentication;
+using Govor.API.Services.Authentication.Interfaces;
+using Govor.Core.Infrastructure.Extensions;
+using Govor.Core.Infrastructure.Validators;
+using Govor.Core.Models;
+using Govor.Core.Repositories.Admins;
+using Govor.Core.Repositories.Invaites;
+using Govor.Core.Repositories.MediasAttachments;
+using Govor.Core.Repositories.Messages;
+using Govor.Core.Repositories.Users;
+using Govor.Data;
+using Govor.Data.Repositories;
+using Microsoft.EntityFrameworkCore;
+
+namespace Govor.API.Extensions;
+
+public static class ConfigurationProgramExtensions
+{
+    public static void AddServices(this IServiceCollection services)
+    {
+        services.AddScoped<IPasswordHasher, PasswordHasher>();
+        services.AddScoped<IJwtService, JwtService>();
+        services.AddScoped<IAccountService, AuthService>();
+        services.AddScoped<IUsersAdministration, UsersService>();
+    }
+
+    public static void AddRepositories(this IServiceCollection services)
+    {
+        services.AddScoped<IUsersRepository, UsersRepository>();
+        services.AddScoped<IMessagesRepository, MessagesRepository>();
+        services.AddScoped<IInvitesRepository, InvitesRepository>();
+        services.AddScoped<IAdminsRepository, AdminsRepository>();
+        services.AddScoped<IMediaAttachmentsRepository, MediaAttachmentsRepository>();
+    }
+
+    public static void AddValidators(this IServiceCollection services)
+    {
+        services.AddScoped<IObjectValidator<User>, UserValidator>();
+        services.AddScoped<IObjectValidator<Message>, MessageValidator>();
+        services.AddScoped<IObjectValidator<MediaAttachments>, MediaAttachmentsValidator>();
+        services.AddScoped<IObjectValidator<Admin>, AdminValidator>();
+        services.AddScoped<IObjectValidator<Invitation>, InvitationValidator>();
+    }
+
+    public static void AddGovorDbContext(this IServiceCollection services, IConfiguration configuration)
+    {
+        services.AddDbContext<GovorDbContext>(
+            options =>
+            {
+                options.UseNpgsql(configuration.GetConnectionString(nameof(GovorDbContext)));
+            }
+        );
+    }
+}
\ No newline at end of file
diff --git a/Govor.API/Program.cs b/Govor.API/Program.cs
index 0186809..6c736f2 100644
--- a/Govor.API/Program.cs
+++ b/Govor.API/Program.cs
@@ -1,5 +1,6 @@
 using System.Security.Cryptography;
 using System.Text;
+using Govor.API.Extensions;
 using Govor.API.Hubs;
 using Govor.API.Services;
 using Govor.API.Services.AdminsStuff;
@@ -75,25 +76,12 @@ builder.Services.AddAuthorization();
 
 builder.Services.AddControllers();
 
-builder.Services.AddScoped<IPasswordHasher, PasswordHasher>();
-builder.Services.AddScoped<IJwtService, JwtService>();
-builder.Services.AddScoped<IAccountService, AuthService>();
-builder.Services.AddScoped<IUsersRepository, UsersRepository>();
-builder.Services.AddScoped<IObjectValidator<User>, UserValidator>();
-builder.Services.AddScoped<IObjectValidator<Message>, MessageValidator>();
-builder.Services.AddScoped<IObjectValidator<MediaAttachments>, MediaAttachmentsValidator>();
-builder.Services.AddScoped<IMessagesRepository, MessagesRepository>();
-builder.Services.AddScoped<IMediaAttachmentsRepository, MediaAttachmentsRepository>();
-builder.Services.AddScoped<IUsersAdministration, UsersService>();
-builder.Services.AddScoped<IInvitesRepository, InvitesRepository>();
-builder.Services.AddScoped<IAdminsRepository, AdminsRepository>();
+// Init DI
+builder.Services.AddServices();
+builder.Services.AddRepositories();
+builder.Services.AddValidators();
 
-builder.Services.AddDbContext<GovorDbContext>(
-    options =>
-    {
-        options.UseNpgsql(builder.Configuration.GetConnectionString(nameof(GovorDbContext)));
-    }
-);
+builder.Services.AddGovorDbContext(configuration); // GovorDbContext init
 
 builder.Services.AddEndpointsApiExplorer();
 
diff --git a/Govor.Core/Models/Invitation.cs b/Govor.Core/Models/Invitation.cs
index f04bf0c..5e3bf01 100644
--- a/Govor.Core/Models/Invitation.cs
+++ b/Govor.Core/Models/Invitation.cs
@@ -4,6 +4,7 @@ public class Invitation
 {
     public Guid Id { get; set; }
     public bool IsAdmin { get; set; }
+    public string Description { get; set; }
     public DateTime DateCreated { get; set; }
     public DateTime EndDate { get; set; }
     public int MaxParticipants { get; set; }