diff --git a/en_US.ISO8859-1/books/handbook/bsdinstall/chapter.xml b/en_US.ISO8859-1/books/handbook/bsdinstall/chapter.xml
--- a/en_US.ISO8859-1/books/handbook/bsdinstall/chapter.xml
+++ b/en_US.ISO8859-1/books/handbook/bsdinstall/chapter.xml
@@ -1731,7 +1731,7 @@
       <listitem>
 	<para><literal>mirror</literal> - Mirroring stores a complete
 	  copy of all data on every disk.  Mirroring provides a good
-	  read perfomance because data is read from all disks in
+	  read performance because data is read from all disks in
 	  parallel.  Write performance is slower as the data must be
 	  written to all disks in the pool.  Allows all but one disk
 	  to fail.  This option requires at least two disks.</para>