diff --git a/functions/math.xml b/functions/math.xml
index 161f94a302..563108eafe 100644
--- a/functions/math.xml
+++ b/functions/math.xml
@@ -842,6 +842,24 @@ $randval = mt_rand();
      the decimals and <parameter>thousands_sep</parameter> instead of
      a comma (",") between every group of thousands.
     </para>
+    <para>
+     For instance, French notation usually use two decimals, 
+     comma (',') as decimal separator, and space (' ') as 
+     thousand separator. This is achieved with this line : 
+     <informalexample>
+      <programlisting role="php">
+&lt;?php
+  $nombre = 1234.56;
+  // english notation (default)
+  $english_format_number = number_format($nombre);
+  // 1,234.56
+  // French notation
+  $nombre_format_francais = number_format($nombre, 2, ',', ' ');
+  // 1 234,56
+?&gt;
+      </programlisting>
+     </informalexample>
+    </para>
    </refsect1>
   </refentry>