diff --git a/README.md b/README.md
index f4551d6..d1fe8ed 100644
--- a/README.md
+++ b/README.md
@@ -79,3 +79,11 @@ Test method `test_repeating_column_table()`.
 
 ---
 
+## Task 6. Duplicate Column Value
+
+Folder `database/migrations/task6` contains a migration for companies table. Edit that migration, so that it would be impossible to create multiple companies with the same name.
+
+Test method `test_duplicate_name()`.
+
+---
+
diff --git a/app/Models/Company.php b/app/Models/Company.php
new file mode 100644
index 0000000..6eda071
--- /dev/null
+++ b/app/Models/Company.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Company extends Model
+{
+    use HasFactory;
+
+    protected $fillable = ['name'];
+}
diff --git a/database/migrations/task6/2021_11_09_083843_create_companies_table.php b/database/migrations/task6/2021_11_09_083843_create_companies_table.php
new file mode 100644
index 0000000..9554406
--- /dev/null
+++ b/database/migrations/task6/2021_11_09_083843_create_companies_table.php
@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateCompaniesTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        // TASK: edit this migration so there couldn't be two companies with the same name
+        Schema::create('companies', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('companies');
+    }
+}
diff --git a/tests/Feature/MigrationsTest.php b/tests/Feature/MigrationsTest.php
index b6f0a56..aaafe29 100644
--- a/tests/Feature/MigrationsTest.php
+++ b/tests/Feature/MigrationsTest.php
@@ -3,9 +3,11 @@
 namespace Tests\Feature;
 
 use App\Models\Category;
+use App\Models\Company;
 use App\Models\Product;
 use App\Models\Project;
 use App\Models\User;
+use Illuminate\Database\QueryException;
 use Illuminate\Support\Facades\Artisan;
 use Tests\TestCase;
 
@@ -72,4 +74,16 @@ class MigrationsTest extends TestCase
 
         Artisan::call('migrate:fresh', ['--path' => '/database/migrations/task5']);
     }
+
+    public function test_duplicate_name()
+    {
+        // We expect that the second Company::create() would throw an exception like
+        // "Integrity constraint violation: 1062 Duplicate entry 'Company One'"
+        $this->expectException(QueryException::class);
+
+        Artisan::call('migrate:fresh', ['--path' => '/database/migrations/task6']);
+
+        Company::create(['name' => 'Company One']);
+        Company::create(['name' => 'Company One']);
+    }
 }