diff --git a/chapter01/changelog.xml b/chapter01/changelog.xml
index 2d72d6d90..62ba02e7c 100644
--- a/chapter01/changelog.xml
+++ b/chapter01/changelog.xml
@@ -124,6 +124,11 @@ First a summary, then a detailed log.</para>
 </itemizedlist>
 </listitem>
 
+<listitem><para>January 10, 2006 [ken]: define YYENABLE_NLS in bison, to
+resolve a code difference shown up by Iterative Comparison Analysis.
+Thanks to Greg Schafer.</para>
+</listitem>
+
 <listitem><para>January 10, 2006 [ken]: Revert my move of mktemp and add a
 sed to correct gccbug.</para>
 </listitem>
diff --git a/chapter06/bison.xml b/chapter06/bison.xml
index f0b3d3fec..d5fb0ae82 100644
--- a/chapter06/bison.xml
+++ b/chapter06/bison.xml
@@ -32,6 +32,13 @@ GCC, Gettext, Glibc, Grep, M4, Make, and Sed</seg></seglistitem>
 
 <screen><userinput>./configure --prefix=/usr</userinput></screen>
 
+<para>The configure system causes bison to be built without support for
+internationalization of error messages if a <command>bison</command>
+program is not already in $PATH.  The following addition will correct
+this.</para>
+
+<screen>echo '#define YYENABLE_NLS 1' >> config.h</screen>  
+
 <para>Compile the package:</para>
 
 <screen><userinput>make</userinput></screen>