diff --git a/doc/src/sgml/release-12.sgml b/doc/src/sgml/release-12.sgml
index aa3ed455f8..eb4f8998cf 100644
--- a/doc/src/sgml/release-12.sgml
+++ b/doc/src/sgml/release-12.sgml
@@ -632,7 +632,7 @@ Author: Peter Geoghegan <pg@bowt.ie>
 -->
 
 <para>
-Have new btree indexes sort duplicate index entries in heap-storage order (Peter Geoghegan)
+Have new btree indexes sort duplicate index entries in heap-storage order (Peter Geoghegan, Heikki Linnakangas)
 </para>
 
 <para>