diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml
index 96d4916e0e9..4d111903a76 100644
--- a/doc/src/sgml/wal.sgml
+++ b/doc/src/sgml/wal.sgml
@@ -85,8 +85,9 @@
     <listitem>
       <para>
         On <productname>FreeBSD</>, IDE drives can be queried using
-        <command>atacontrol</command>, and SCSI drives using
-        <command>sdparm</command>.
+        <command>atacontrol</command> and write caching turned off using
+        <literal>hw.ata.wc=0</> in <filename>/boot/loader.conf</>;
+        SCSI drives use <command>sdparm</command>.
       </para>
     </listitem>