diff --git a/lib/private/Files/Storage/Local.php b/lib/private/Files/Storage/Local.php
index 62a04292e23..0e118e76c5f 100644
--- a/lib/private/Files/Storage/Local.php
+++ b/lib/private/Files/Storage/Local.php
@@ -609,6 +609,7 @@ class Local extends \OC\Files\Storage\Common {
 	}
 
 	public function writeStream(string $path, $stream, int $size = null): int {
+		/** @var int|false $result We consider here that returned size will never be a float because we write less than 4GB */
 		$result = $this->file_put_contents($path, $stream);
 		if (is_resource($stream)) {
 			fclose($stream);