diff --git a/scripts/migrate-szuru1.php b/scripts/migrate-szuru1.php
index 66816a43..f4fa7a42 100644
--- a/scripts/migrate-szuru1.php
+++ b/scripts/migrate-szuru1.php
@@ -55,11 +55,16 @@ function removeRecursively($dir)
 
 abstract class Task
 {
+	private $warnings = [];
+
 	public function execute()
 	{
 		echo $this->getDescription() . '...';
 		$this->run();
 		echo PHP_EOL;
+
+		foreach ($this->warnings as $message)
+			echo 'Warning: ' . $message . PHP_EOL;
 	}
 
 	protected function progress()
@@ -67,6 +72,11 @@ abstract class Task
 		echo '.';
 	}
 
+	protected function warn($message)
+	{
+		$this->warnings[] = $message;
+	}
+
 	protected function withProgress($source, $callback, $chunkSize = 666, callable $callbackLoopRunner = null)
 	{
 		if ($source instanceof \Traversable)