diff --git a/functions/fdf.xml b/functions/fdf.xml
index 5c6a95eb16..43b82f8f7b 100644
--- a/functions/fdf.xml
+++ b/functions/fdf.xml
@@ -542,6 +542,34 @@ unlink("outtest.fdf");
     </para>
    </refsect1>
   </refentry>
+
+  <refentry id="function.fdf-set-encoding">
+   <refnamediv>
+    <refname>fdf_set_encoding</refname>
+    <refpurpose>Sets FDF character encoding</refpurpose>
+   </refnamediv>
+   <refsect1>
+    <title>Description</title>
+    <funcsynopsis>
+     <funcprototype>
+      <funcdef>bool <function>fdf_set_encoding</function></funcdef>
+      <paramdef>int <parameter>fdf_document</parameter></paramdef>
+      <paramdef>string <parameter>encoding</parameter></paramdef>
+     </funcprototype>
+    </funcsynopsis>
+    <para>
+     The <function>fdf_set_encoding</function> sets the character
+     encoding in FDF document. <parameter>encoding</parameter> 
+     should be the valid encoding name such as "Shift-JIS" or
+     "Unicode".
+    </para>
+    <para>
+     The <function>fdf_set_encoding</function> is available in
+     PHP-4.0.7 or later.
+    </para>
+   </refsect1>
+  </refentry>
+
  </reference>
 
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