diff --git a/doc/src/sgml/release-15.sgml b/doc/src/sgml/release-15.sgml
index 4a46c4278c4..f7344b98841 100644
--- a/doc/src/sgml/release-15.sgml
+++ b/doc/src/sgml/release-15.sgml
@@ -757,7 +757,7 @@ Author: John Naylor <john.naylor@postgresql.org>
 
 <listitem>
 <para>
-Improve validation of UTF-8 text (even if only ASCII) by processing 16 bytes at a time (John Naylor)
+Improve validation of UTF-8 text (even if only ASCII) by processing 16 bytes at a time (John Naylor, Heikki Linnakangas)
 </para>
 
 <para>