diff --git a/doc/src/sgml/release-10.sgml b/doc/src/sgml/release-10.sgml
new file mode 100644
index ea86b5e..5862cd8
*** a/doc/src/sgml/release-10.sgml
--- b/doc/src/sgml/release-10.sgml
*************** Branch: REL_10_STABLE [5159626af] 2017-1
*** 4065,4070 ****
--- 4065,4081 ----
         </para>
        </listitem>
  
+       <listitem>
+ <!--
+ This was disabled in the PG 9.6 branch so there is no commit here.
+ -->
+        <para>
+         Enable parallelism by default by changing the default setting
+         of <xref linkend="guc-max-parallel-workers-per-gather"/> to
+         <literal>2</literal>.
+        </para>
+       </listitem>
+ 
       </itemizedlist>
  
      </sect4>