diff --git a/pep-0552.txt b/pep-0552.txt
index f09bfdc6f..db0d5bdc7 100644
--- a/pep-0552.txt
+++ b/pep-0552.txt
@@ -104,8 +104,8 @@ References
 Credits
 =======
 
-The author would like to thank Gregory P. Smith for useful conversations on the
-topic of this PEP.
+The author would like to thank Gregory P. Smith, Christian Heimes, and Steve
+Dower for useful conversations on the topic of this PEP.
 
 
 Copyright