diff --git a/Kindle-Store-bad-formatting.md b/Kindle-Store-bad-formatting.md
index 41a708e..0e77cea 100644
--- a/Kindle-Store-bad-formatting.md
+++ b/Kindle-Store-bad-formatting.md
@@ -88,6 +88,8 @@ with minimal artifacting around the text,
 which can be very noticeable around page refreshes.
 I've noticed Kindle Store manga having very heavy jpg compression artifacts, especially around text.
 
+PNG and GIF can offer much better compression for monochrome manga images than JPG, but the PNG/GIF renderer on Kindle is [rather buggy](https://github.com/ciromattia/kcc/issues/665):
+
 ## gaps between spreads
 
 ![IMG_1507-0010](https://github.com/user-attachments/assets/945ae008-e894-48fe-b881-35199c098e9b)