*** a/doc/src/sgml/config.sgml
--- b/doc/src/sgml/config.sgml
***************
*** 1662,1667 **** SET ENABLE_SEQSCAN TO OFF;
--- 1662,1670 ----
          to allow the transaction to commit asynchronously.  However, the
          special value <literal>local</> is available for transactions that
          wish to wait for local flush to disk, but not synchronous replication.
+         If <varname>synchronous_standby_names</> is not set, <literal>on</>,
+         <literal>remote_write</> and <literal>local</> provide the same
+         synchronization level; transaction commit only waits for local flush.
         </para>
         <para>
          This parameter can be changed at any time; the behavior for any