*** a/doc/src/sgml/config.sgml
--- b/doc/src/sgml/config.sgml
***************
*** 5700,5706 **** plruby.use_strict = true        # generates error: unknown class name
       </varlistentry>
  
       <varlistentry id="guc-trace-recovery-messages" xreflabel="trace_recovery_messages">
!       <term><varname>trace_recovery_messages</varname> (<type>string</type>)</term>
        <indexterm>
         <primary><varname>trace_recovery_messages</> configuration parameter</primary>
        </indexterm>
--- 5700,5706 ----
       </varlistentry>
  
       <varlistentry id="guc-trace-recovery-messages" xreflabel="trace_recovery_messages">
!       <term><varname>trace_recovery_messages</varname> (<type>enum</type>)</term>
        <indexterm>
         <primary><varname>trace_recovery_messages</> configuration parameter</primary>
        </indexterm>