diff --git a/markdown/converting-to-markdown.md b/markdown/converting-to-markdown.md
index ee6e2648c..666b15314 100644
--- a/markdown/converting-to-markdown.md
+++ b/markdown/converting-to-markdown.md
@@ -4,7 +4,7 @@ If you copy and paste from a web page - including a full table - into a GitHub i
 
 ![GitHub converting to Markdown](https://raw.githubusercontent.com/simonw/til/main/markdown/converting-to-markdown.gif)
 
-https://domchristie.github.io/turndown/ is an open source JavaScript library by Dom Christie that can convert HTML strings into Markdown strings. Code: https://github.com/domchristie/turndown - it used to be called `to-markdown`.
+https://mixmark-io.github.io/turndown/ is an open source JavaScript library by Dom Christie that can convert HTML strings into Markdown strings. Code: https://github.com/mixmark-io/turndown - it used to be called `to-markdown` and lived at `domchristie.github.io/turndown`, which now 404s.
 
 https://euangoddard.github.io/clipboard2markdown/ is a tool which lets you paste in rich-text and uses turndown to convert it for you directly in your browser.