diff --git a/doc/src/sgml/release-12.sgml b/doc/src/sgml/release-12.sgml
new file mode 100644
index 4c55656..6b54a9e
*** a/doc/src/sgml/release-12.sgml
--- b/doc/src/sgml/release-12.sgml
*************** Author: Tom Lane <tgl@sss.pgh.pa.us>
*** 3228,3233 ****
--- 3228,3245 ----
  
       <listitem>
  <!--
+ Author: Peter Geoghegan <pg@bowt.ie>
+ 2019-03-20 [c1afd175b] Allow amcheck to re-find tuples using new search.
+ -->
+ 
+       <para>
+        Add a parameter to a <xref linkend="amcheck"/> function to check
+        each index tuple from the root of the tree.
+       </para>
+      </listitem>
+ 
+      <listitem>
+ <!--
  Author: Michael Paquier <michael@paquier.xyz>
  2018-08-28 [1aaf532de] Rework option set of oid2name
  Author: Michael Paquier <michael@paquier.xyz>