In release notes, mention the need to initialize bgw_notify_pid.

Michael Paquier

Author: robertmhaas

doc/src/sgml/release-9.4.sgml

@@ -305,6 +305,15 @@
      </para>
     </listitem>
 
+    <listitem>
+     <para>
+      <link linkend="bgworker">background workers</link> registered at
+      postmaster startup time should set
+      <structfield>bgw_notify_pid</structfield> to 0.
+      <command></>
+     </para>
+    </listitem>
+
     <listitem>
      <para>
       <command>DISCARD ALL</> now also discards sequence state.