diff --git a/chapters/config.xml b/chapters/config.xml
index 4e9bdddd59..98ab77ea1a 100644
--- a/chapters/config.xml
+++ b/chapters/config.xml
@@ -1503,6 +1503,77 @@ NOTYPE</programlisting>
     </variablelist>
    </sect2>
 
+   <sect2 id="ini.sect.mbstring">
+    <title>Multi-Byte String Configuration Directives</title>
+    <variablelist>
+     
+     <varlistentry id="ini.mbstring.internal-encoding">
+      <term>
+       <parameter>mbstring.internal_encoding</parameter>
+       <type>string</type>
+      </term>
+      <listitem>
+       <para>
+        <literal>mbstring.internal_encoding</literal> defines default
+	 internal character encoding.
+       </para>
+      </listitem>
+     </varlistentry>
+
+     <varlistentry id="ini.mbstring.http-input">
+      <term>
+       <parameter>mbstring.http_input</parameter>
+       <type>string</type>
+      </term>
+      <listitem>
+       <para>
+        <literal>mbstring.http_input</literal> defines default
+	 HTTP input character encoding.
+       </para>
+      </listitem>
+     </varlistentry>
+
+     <varlistentry id="ini.mbstring.http-output">
+      <term>
+       <parameter>mbstring.http_output</parameter>
+       <type>string</type>
+      </term>
+      <listitem>
+       <para>
+        <literal>mbstring.http_output</literal> defines default
+	 HTTP output character encoding.
+       </para>
+      </listitem>
+     </varlistentry>
+
+     <varlistentry id="ini.mbstring.detect-order">
+      <term>
+       <parameter>mbstring.detect_order</parameter>
+       <type>string</type>
+      </term>
+      <listitem>
+       <para>
+        <literal>mbstring.detect_order</literal> defines default
+	 character encoding detection order.
+       </para>
+      </listitem>
+     </varlistentry>
+
+     <varlistentry id="ini.mbstring.substitute-character">
+      <term>
+       <parameter>mbstring.substitute_character</parameter>
+       <type>string</type>
+      </term>
+      <listitem>
+       <para>
+        <literal>mbstring.substitute_character</literal> defines
+        character to substitute for invalid character codes.
+       </para>
+      </listitem>
+     </varlistentry>
+    </variablelist>
+   </sect2>
+
   </sect1>
 
  </chapter>