diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml
index a2724fa..1e67bbd 100644
*** /tmp/pgrevert.14281/7sLqTb_wal.sgml	Tue Nov 30 21:57:17 2010
--- doc/src/sgml/wal.sgml	Tue Nov 30 21:56:49 2010
***************
*** 164,173 ****
     <productname>PostgreSQL</> periodically writes full page images to
     permanent WAL storage <emphasis>before</> modifying the actual page on
     disk. By doing this, during crash recovery <productname>PostgreSQL</> can
!    restore partially-written pages.  If you have a battery-backed disk
!    controller or file-system software that prevents partial page writes
!    (e.g., ZFS),  you can turn off this page imaging by turning off the
!    <xref linkend="guc-full-page-writes"> parameter.
    </para>
   </sect1>
  
--- 164,175 ----
     <productname>PostgreSQL</> periodically writes full page images to
     permanent WAL storage <emphasis>before</> modifying the actual page on
     disk. By doing this, during crash recovery <productname>PostgreSQL</> can
!    restore partially-written pages.  If you have file-system software
!    that prevents partial page writes (e.g., ZFS),  you can turn off
!    this page imaging by turning off the <xref
!    linkend="guc-full-page-writes"> parameter. Battery-Backed unit
!    (BBU) disk controllers do not prevent partial page writes unless
!    they guarantee that data is written to the BBU as full (8kB) pages.
    </para>
   </sect1>