diff --git a/doc/src/sgml/release-15.sgml b/doc/src/sgml/release-15.sgml
index 47ac329e79..179ad37d9d 100644
--- a/doc/src/sgml/release-15.sgml
+++ b/doc/src/sgml/release-15.sgml
@@ -994,7 +994,8 @@ Author: Peter Geoghegan <pg@bowt.ie>
       <listitem>
        <para>
         Allow <link linkend="routine-vacuuming">vacuum</link> to be more
-        aggressive in setting the oldest frozenxid (Peter Geoghegan)
+        aggressive in setting the oldest frozen and multi transaction id
+        (Peter Geoghegan)
        </para>
       </listitem>