diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index 557810f6c..3c0094817 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -637,7 +637,7 @@ class Image:
         """iPython display hook support
 
         :param format: Image format.
-        :returns: png version of the image as bytes
+        :returns: image as bytes, saved into the given format.
         """
         b = io.BytesIO()
         try: