diff --git a/chapter06/man.xml b/chapter06/man.xml
index bc0404e9e..b6c9a312d 100644
--- a/chapter06/man.xml
+++ b/chapter06/man.xml
@@ -30,13 +30,13 @@ Glibc, Grep, Make, and Sed</seg></seglistitem>
 
 <para>Two adjustments need to be made to the sources of Man.</para>
 
-<para>The first is a sed substitution to add the
+<para>The first is a <command>sed</command> substitution to add the
 <parameter>-R</parameter> switch to the <envar>PAGER</envar>
 variable so that escape sequences are properly handled by Less:</para>
 
 <screen><userinput>sed -i 's@-is@&amp;R@g' configure</userinput></screen>
 
-<para>The second is also a sed substitution to comment out the
+<para>The second is also a <command>sed</command> substitution to comment out the
 <quote>MANPATH /usr/man</quote> line in the
 <filename>man.conf</filename> file to prevent redundant results when
 using programs such as <command>whatis</command>:</para>