diff --git a/chapter05/gcc-pass1.xml b/chapter05/gcc-pass1.xml
index 7a431ec90..e0d503f8d 100644
--- a/chapter05/gcc-pass1.xml
+++ b/chapter05/gcc-pass1.xml
@@ -208,6 +208,14 @@ cd       build</userinput></screen>
     header using a command that is identical to what the GCC build system does
     in normal circumstances:</para>
 
+    <note>
+      <para>The command below shows an example of nested command substitution
+      using two methods: backquotes and a $() construct.  It could be rewritten 
+      using the same method for both substitutions, but is shown this way
+      to demonstrate how they can be mixed.  Generally the $() method is
+      preferred.</para>
+    </note>
+
 <screen><userinput remap="install">cd ..
 cat gcc/limitx.h gcc/glimits.h gcc/limity.h > \
   `dirname $($LFS_TGT-gcc -print-libgcc-file-name)`/install-tools/include/limits.h</userinput></screen>