diff --git a/src/Commands/AddCommand.php b/src/Commands/AddCommand.php
new file mode 100644
index 0000000..6c3e0fa
--- /dev/null
+++ b/src/Commands/AddCommand.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace Dex\Composer\PlugAndPlay\Commands;
+
+use Composer\Command\BaseCommand;
+use Dex\Composer\PlugAndPlay\PlugAndPlayInterface;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class AddCommand extends BaseCommand
+{
+    use CommandNaming, ComposerCreator;
+
+    protected function configure(): void
+    {
+        parent::configure();
+
+        $this->naming('plug-and-play:add');
+        $this->setDescription('Add a required package to install using plug and play plugin.');
+        $this->addArgument('package', InputArgument::REQUIRED, 'Package to add in plug and play dependencies');
+        $this->addArgument('version', InputArgument::OPTIONAL, 'Version of the package', '*');
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output): int
+    {
+        $output->writeln('<info>You are using Composer Plug and Play Plugin.</info>');
+
+        if (file_exists(PlugAndPlayInterface::PACKAGES_FILE) === false) {
+            $output->writeln('The [' . PlugAndPlayInterface::PACKAGES_FILE . '] file not exists.');
+
+            return 1;
+        }
+
+        $composer = file_get_contents(PlugAndPlayInterface::PACKAGES_FILE);
+
+        $json = json_decode($composer, true);
+
+        $json['require'][$input->getArgument('package')] = $input->getArgument('version');
+
+        $json = json_encode($json, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
+
+        file_put_contents(PlugAndPlayInterface::PACKAGES_FILE, $json);
+
+        return 0;
+    }
+}
diff --git a/src/PlugAndPlayPlugin.php b/src/PlugAndPlayPlugin.php
index 4ee019a..189e668 100644
--- a/src/PlugAndPlayPlugin.php
+++ b/src/PlugAndPlayPlugin.php
@@ -7,6 +7,7 @@
 use Composer\Plugin\Capability\CommandProvider;
 use Composer\Plugin\Capable;
 use Composer\Plugin\PluginInterface;
+use Dex\Composer\PlugAndPlay\Commands\AddCommand;
 use Dex\Composer\PlugAndPlay\Commands\DumpAutoloadCommand;
 use Dex\Composer\PlugAndPlay\Commands\InitCommand;
 use Dex\Composer\PlugAndPlay\Commands\InstallCommand;
@@ -44,6 +45,7 @@ public function getCommands(): array
             new InstallCommand(),
             new UpdateCommand(),
             new DumpAutoloadCommand(),
+            new AddCommand(),
             new InitCommand(),
         ];
     }
diff --git a/tests/CommandTestCase.php b/tests/CommandTestCase.php
new file mode 100644
index 0000000..ac22037
--- /dev/null
+++ b/tests/CommandTestCase.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace Dex\Composer\PlugAndPlay\Tests;
+
+use Dex\Composer\PlugAndPlay\PlugAndPlayInterface;
+use Symfony\Component\Console\Input\StringInput;
+use Symfony\Component\Console\Output\BufferedOutput;
+
+abstract class CommandTestCase extends TestCase
+{
+    protected string $directory = __DIR__ . '/../../tmp/';
+
+    protected function runCommand(string $command): BufferedOutput
+    {
+        $application = new Application();
+        $input = new StringInput("$command -d $this->directory");
+        $output = new BufferedOutput();
+
+        $application->doRun($input, $output);
+
+        return $output;
+    }
+
+    protected function encodeContent(array $data): string
+    {
+        return json_encode(
+            $data,
+            JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE
+        );
+    }
+
+    protected function packagesFile(): string
+    {
+        return $this->directory . PlugAndPlayInterface::PACKAGES_FILE;
+    }
+}
diff --git a/tests/Unit/Commands/AddCommandTest.php b/tests/Unit/Commands/AddCommandTest.php
new file mode 100644
index 0000000..2ae6772
--- /dev/null
+++ b/tests/Unit/Commands/AddCommandTest.php
@@ -0,0 +1,83 @@
+<?php
+
+namespace Dex\Composer\PlugAndPlay\Tests\Unit\Commands;
+
+use Dex\Composer\PlugAndPlay\PlugAndPlayInterface;
+use Dex\Composer\PlugAndPlay\Tests\CommandTestCase;
+
+class AddCommandTest extends CommandTestCase
+{
+    protected function setUp(): void
+    {
+        $composer = json_encode([
+            'name' => 'dex/test',
+            'config' => [
+                'allow-plugins' => [
+                    'dex/composer-plug-and-play' => true,
+                    'dex/fake' => true,
+                ],
+            ],
+        ], JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
+
+        mkdir($this->directory);
+        mkdir($this->directory . PlugAndPlayInterface::PACKAGES_PATH);
+        file_put_contents($this->directory . 'composer.json', $composer);
+    }
+
+    protected function createPackagesComposerJson(): void
+    {
+        $base = json_encode([
+            'minimum-stability' => 'dev',
+        ], JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
+
+        file_put_contents($this->packagesFile(), $base);
+    }
+
+    protected function tearDown(): void
+    {
+        exec('rm -r ' . $this->directory);
+    }
+
+    public function test(): void
+    {
+        $this->createPackagesComposerJson();
+
+        $this->runCommand('plug-and-play:add dex/extra');
+
+        $expected = $this->encodeContent([
+            'minimum-stability' => 'dev',
+            'require' => [
+                'dex/extra' => '*',
+            ],
+        ]);
+
+        $this->assertFileExists($this->packagesFile());
+        $this->assertJsonStringEqualsJsonFile($this->packagesFile(), $expected);
+    }
+
+    public function testWithVersion(): void
+    {
+        $this->createPackagesComposerJson();
+
+        $this->runCommand('plug-and-play:add dex/extra 1.0');
+
+        $expected = $this->encodeContent([
+            'minimum-stability' => 'dev',
+            'require' => [
+                'dex/extra' => '1.0',
+            ],
+        ]);
+
+        $this->assertFileExists($this->packagesFile());
+        $this->assertJsonStringEqualsJsonFile($this->packagesFile(), $expected);
+    }
+
+    public function testFileNotExists(): void
+    {
+        $output = $this->runCommand('plug-and-play:add dex/extra');
+
+        $message = 'The [' . PlugAndPlayInterface::PACKAGES_FILE . '] file not exists.';
+
+        $this->assertStringContainsString($message, $output->fetch());
+    }
+}