diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml
new file mode 100644
index c66ae29..186c361
*** a/doc/src/sgml/wal.sgml
--- b/doc/src/sgml/wal.sgml
***************
*** 153,160 ****
     drive cannot guarantee the data will be written before shutdown.
     If you use SSDs, be aware that many of these do not honor cache flush
     commands by default.
!    You can test for reliable I/O subsystem behavior using <ulink
!    url="http://brad.livejournal.com/2116715.html"><filename>diskchecker.pl</filename></ulink>.
    </para>
  
    <para>
--- 153,162 ----
     drive cannot guarantee the data will be written before shutdown.
     If you use SSDs, be aware that many of these do not honor cache flush
     commands by default.
!    You can test for reliable I/O subsystem behavior using
!    <application>diskchecker.pl</> (<ulink
!    url="http://brad.livejournal.com/2116715.html">description</ulink>, <ulink
!    url="https://gist.github.com/3172656">script</ulink>).
    </para>
  
    <para>