--- chapter.sgml.0	2008-06-30 21:11:24.000000000 -0400
+++ chapter.sgml	2008-06-30 22:09:30.000000000 -0400
@@ -2380,12 +2380,19 @@
 	<command>dump</command> and <command>restore</command>.  They
 	operate on the drive as a collection of disk blocks, below the
 	abstractions of files, links and directories that are created by
-	the file systems. <command>dump</command> backs up an entire
+	the file systems. Unlike other backup software,
+	<command>dump</command> backs up an entire
 	file system on a device.  It is unable to backup only part of a
 	file system or a directory tree that spans more than one
-	file system.  <command>dump</command> does not write files and
+	file system.  The <command>dump</command> command does not write files and
 	directories to tape, but rather writes the raw data blocks that
-	comprise files and directories.</para>
+	comprise files and directories.  When being used to extract
+	data, <command>restore</command> stores temporary files
+	in <filename>/tmp/</filename> by default &emdash; if you are
+	operating from a recovery disk with a small
+	<filename>/tmp</filename> directory, you may need to set the
+	<envar>TMPDIR</envar> environment variable to a directory
+	with more free space for the restore to be successful.</para>
 
       <note><para>If you use <command>dump</command> on your root directory, you
         would not back up <filename>/home</filename>,