diff --git a/pep-0563.rst b/pep-0563.rst
index 76f82965d..771e64cc9 100644
--- a/pep-0563.rst
+++ b/pep-0563.rst
@@ -666,6 +666,10 @@ This document could not be completed without valuable input,
 encouragement and advice from Guido van Rossum, Jukka Lehtosalo, and
 Ivan Levkivskyi.
 
+The implementation was throroughly reviewed by Serhiy Storchaka who
+found all sorts of issues, including bugs, bad readability, and
+performance problems.
+
 
 Copyright
 =========