diff --git a/posts/build_a_blog.md b/posts/build_a_blog.md
index 0ffd78e..6a80533 100644
--- a/posts/build_a_blog.md
+++ b/posts/build_a_blog.md
@@ -923,7 +923,9 @@ INFO: number of *.html files 1002
 INFO: cleanup __bench files
 ```
 
-So that's down to ~1.5s for 1000 posts. Not a bad start!
+Did I accidetally duplicate output during [one of the refactors of this multithreading change][duped]? Yup!
+
+But now down to ~1.5s for 1000 posts 🎉
 
 [1]: https://crystal-lang.org/
 [2]: https://github.com/crystal-lang/crystal/releases/tag/0.31.0
@@ -931,3 +933,4 @@ So that's down to ~1.5s for 1000 posts. Not a bad start!
 [4]: https://python-markdown.github.io/
 [5]: https://archlinux.org/packages/extra/any/python-markdown/
 [hugo]: https://gohugo.io/
+[duped]: https://git.sr.ht/~cfebs/cfebs.srht.site/commit/4b39494e827245ce1fbf1cbd983786e8db34c645