diff --git a/src/Object/File/FileUploadMetadata.php b/src/Object/File/FileUploadMetadata.php
index 3bacf30..65fb209 100644
--- a/src/Object/File/FileUploadMetadata.php
+++ b/src/Object/File/FileUploadMetadata.php
@@ -20,6 +20,9 @@ final class FileUploadMetadata {
 	/** @var string */
 	private $hash;
 
+	/** @var int|null */
+	private $mtime;
+
 	/**
 	 * @param int $length 
 	 * @param string $hash 
@@ -94,4 +97,4 @@ public static function resourceLength($stream): int
 	{
 		return fstat($stream)['size'];
 	}
-}
\ No newline at end of file
+}