diff --git a/appendices/ini.core.xml b/appendices/ini.core.xml
index 02f01f39b2..30548bf6c1 100644
--- a/appendices/ini.core.xml
+++ b/appendices/ini.core.xml
@@ -1300,6 +1300,27 @@ include_path=".;c:\php\includes"
         './file'</literal> than having PHP always check the current
         directory for every include.
        </para>
+       <note>
+        <para>
+         <literal>ENV</literal> variables are also accessible in .ini files.
+         As such it is possible to reference the home directory using
+         <literal>${LOGIN}</literal> and <literal>${USER}</literal>.
+        </para>
+        <para>
+         Environment variables may vary between Server APIs as those environments
+         may be different.
+        </para>       
+       </note>
+       <para>
+        <example>
+         <title>Unix include_path using ${USER} env variable</title>
+         <programlisting role="php.ini">
+<![CDATA[
+include_path = ".:${USER}/pear/php"
+]]>
+         </programlisting>
+        </example>
+       </para>
       </listitem>
      </varlistentry>