diff --git a/src/Output/QRImage.php b/src/Output/QRImage.php
index 2ebab0abe..967b4cd13 100644
--- a/src/Output/QRImage.php
+++ b/src/Output/QRImage.php
@@ -90,7 +90,7 @@ class QRImage extends QROutputAbstract{
 	/**
 	 * @inheritDoc
 	 *
-	 * @return string|\GdImage
+	 * @return string|resource|\GdImage
 	 *
 	 * @phan-suppress PhanUndeclaredTypeReturnType, PhanTypeMismatchReturn
 	 */