Index: doc/src/sgml/monitoring.sgml
===================================================================
RCS file: /cvsroot/pgsql/doc/src/sgml/monitoring.sgml,v
retrieving revision 1.67
diff -c -c -r1.67 monitoring.sgml
*** doc/src/sgml/monitoring.sgml	9 Apr 2009 22:32:02 -0000	1.67
--- doc/src/sgml/monitoring.sgml	10 Apr 2009 03:12:00 -0000
***************
*** 927,934 ****
       <function>pg_stat_get_blocks_fetched</function> minus
       <function>pg_stat_get_blocks_hit</function> gives the number of kernel
       <function>read()</> calls issued for the table, index, or
!      database; but the actual number of physical reads is usually
!      lower due to kernel-level buffering.
      </para>
     </note>
  
--- 927,935 ----
       <function>pg_stat_get_blocks_fetched</function> minus
       <function>pg_stat_get_blocks_hit</function> gives the number of kernel
       <function>read()</> calls issued for the table, index, or
!      database; the number of actual physical reads is usually
!      lower due to kernel-level buffering.  The <literal>*_blks_read</>
!      statistics columns uses this subtraction, i.e. fetched minus hit.
      </para>
     </note>