diff --git a/Command/CommandHelper.php b/Command/CommandHelper.php
index 979265f..83c319c 100644
--- a/Command/CommandHelper.php
+++ b/Command/CommandHelper.php
@@ -46,7 +46,7 @@ public static function configureMigrations(ContainerInterface $container, Config
     }
 
     /**
-     * @param string $dmName
+     * @param null|string $dmName
      */
     public static function setApplicationDocumentManager(Application $application, $dmName): void
     {
diff --git a/Command/MigrationsExecuteCommand.php b/Command/MigrationsExecuteCommand.php
index 31e2580..8ec900e 100644
--- a/Command/MigrationsExecuteCommand.php
+++ b/Command/MigrationsExecuteCommand.php
@@ -28,7 +28,7 @@ protected function configure()
 
         $this
             ->setName('mongodb:migrations:execute')
-            ->addOption('dm', null, InputOption::VALUE_OPTIONAL, 'The document manager to use for this command.', 'default_document_manager')
+            ->addOption('dm', null, InputOption::VALUE_OPTIONAL, 'The document manager to use for this command.')
         ;
     }
 
diff --git a/Command/MigrationsGenerateCommand.php b/Command/MigrationsGenerateCommand.php
index 2218df3..593ccc0 100644
--- a/Command/MigrationsGenerateCommand.php
+++ b/Command/MigrationsGenerateCommand.php
@@ -28,7 +28,7 @@ protected function configure()
 
         $this
             ->setName('mongodb:migrations:generate')
-            ->addOption('dm', null, InputOption::VALUE_OPTIONAL, 'The document manager to use for this command.', 'default_document_manager')
+            ->addOption('dm', null, InputOption::VALUE_OPTIONAL, 'The document manager to use for this command.')
         ;
     }
 
diff --git a/Command/MigrationsMigrateCommand.php b/Command/MigrationsMigrateCommand.php
index 73a2ada..bbd107e 100644
--- a/Command/MigrationsMigrateCommand.php
+++ b/Command/MigrationsMigrateCommand.php
@@ -28,7 +28,7 @@ protected function configure()
 
         $this
             ->setName('mongodb:migrations:migrate')
-            ->addOption('dm', null, InputOption::VALUE_OPTIONAL, 'The document manager to use for this command.', 'default_document_manager')
+            ->addOption('dm', null, InputOption::VALUE_OPTIONAL, 'The document manager to use for this command.')
         ;
     }
 
diff --git a/Command/MigrationsStatusCommand.php b/Command/MigrationsStatusCommand.php
index 226a849..a48f761 100644
--- a/Command/MigrationsStatusCommand.php
+++ b/Command/MigrationsStatusCommand.php
@@ -28,7 +28,7 @@ protected function configure()
 
         $this
             ->setName('mongodb:migrations:status')
-            ->addOption('dm', null, InputOption::VALUE_OPTIONAL, 'The document manager to use for this command.', 'default_document_manager')
+            ->addOption('dm', null, InputOption::VALUE_OPTIONAL, 'The document manager to use for this command.')
         ;
     }
 
diff --git a/Command/MigrationsVersionCommand.php b/Command/MigrationsVersionCommand.php
index 42d262f..787a5f8 100644
--- a/Command/MigrationsVersionCommand.php
+++ b/Command/MigrationsVersionCommand.php
@@ -28,7 +28,7 @@ protected function configure()
 
         $this
             ->setName('mongodb:migrations:version')
-            ->addOption('dm', null, InputOption::VALUE_OPTIONAL, 'The document manager to use for this command.', 'default_document_manager')
+            ->addOption('dm', null, InputOption::VALUE_OPTIONAL, 'The document manager to use for this command.')
         ;
     }