diff --git a/src/ImageSharp/Formats/Heif/Readme.md b/src/ImageSharp/Formats/Heif/Readme.md
index 6c7469528f..5dddf81f10 100644
--- a/src/ImageSharp/Formats/Heif/Readme.md
+++ b/src/ImageSharp/Formats/Heif/Readme.md
@@ -4,4 +4,6 @@
 
 [HEIF reference implementation from Nokia](https://github.com/nokiatech/heif)
 
+[AVIF reference implementation](http://gitlab.com/AOMediaCodec/SVT-AV1)
+
 [Apple's metadata syntax in HEIC images](http://cheeky4n6monkey.blogspot.com/2017/10/monkey-takes-heic.html)