diff --git a/README.md b/README.md
index 717e8b6..a5c99c6 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,7 @@ This repo contains implementations for the following languages:
 
 These additional implementations also exist outside of this repo:
 
+* C: https://github.com/google/wuffs (Wuffs implements many image file formats; look at its stb-imagedumper demo mode for a thumbhash example)
 * Go: https://github.com/galdor/go-thumbhash
 * Perl: https://github.com/mauke/Image-ThumbHash
 * PHP: https://github.com/SRWieZ/thumbhash