diff --git a/doc/src/sgml/release-12.sgml b/doc/src/sgml/release-12.sgml
new file mode 100644
index 76abc95..aa3845f
*** a/doc/src/sgml/release-12.sgml
--- b/doc/src/sgml/release-12.sgml
*************** Author: Tom Lane <tgl@sss.pgh.pa.us>
*** 842,847 ****
--- 842,859 ----
        <listitem>
  <!--
  Author: Tom Lane <tgl@sss.pgh.pa.us>
+ 2019-03-25 [8edd0e794] Suppress Append and MergeAppend plan nodes that have a s
+ -->
+ 
+        <para>
+         Improve optimization of partition and <literal>UNION ALL</literal>
+         queries that have only a single child (David Rowley)
+        </para>
+       </listitem>
+ 
+       <listitem>
+ <!--
+ Author: Tom Lane <tgl@sss.pgh.pa.us>
  2018-12-13 [04fe805a1] Drop no-op CoerceToDomain nodes from expressions at plan
  -->