diff --git a/src/Faker/Generator.php b/src/Faker/Generator.php
index ec77c08749..2cad02d7a8 100644
--- a/src/Faker/Generator.php
+++ b/src/Faker/Generator.php
@@ -275,7 +275,7 @@
  *
  * @property string $imageUrl
  *
- * @method string imageUrl($width = 640, $height = 480, $category = null, $randomize = true, $word = null, $gray = false)
+ * @method string imageUrl($width = 640, $height = 480, $category = null, $randomize = true, $word = null, $gray = false, string $format = 'png')
  *
  * @property string $image
  *