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diff --git a/doc/pazpar2_conf.xml b/doc/pazpar2_conf.xml
index fbd39fb..6f4f3e0 100644
--- a/doc/pazpar2_conf.xml
+++ b/doc/pazpar2_conf.xml
@@ -1274,6 +1274,25 @@
      </listitem>
     </varlistentry>
     <varlistentry>
+     <term>pz:extendrecs</term>
+     <listitem>
+      <para>
+       If a show command goes to the boundary of a result set for a
+       database - depends on sorting - and pz:extendrecs is set to a positive
+       value. then Pazpar2 wait for show to fetch pz:extendrecs more
+       records. This setting is best used if a
+       database does native sorting, because the result set otherwise may
+       be completely re-sorted during extended fetch.
+      </para>
+      <warning>
+       <para>
+	The pz:extendrecs setting appeared in Pazpar2 version 1.6.26.
+	But the bahavior changed with the release of Pazpar2 1.6.29.
+       </para>
+      </warning>
+     </listitem>
+    </varlistentry>
+    <varlistentry>
      <term>pz:presentchunk</term>
      <listitem>
       <para>