diff --git a/reference/filesystem/functions/parse-ini-file.xml b/reference/filesystem/functions/parse-ini-file.xml
index ebbd457070..e43f079bab 100644
--- a/reference/filesystem/functions/parse-ini-file.xml
+++ b/reference/filesystem/functions/parse-ini-file.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.19 $ -->
+<!-- $Revision: 1.20 $ -->
 <!-- splitted from ./en/functions/filesystem.xml, last change in rev 1.87 -->
   <refentry id="function.parse-ini-file">
    <refnamediv>
@@ -51,6 +51,8 @@
      <simpara>
       There are reserved words which must not be used as keys for
       ini files.  These include: null, yes, no, true, and false.
+      Characters <literal>|&amp;~![()"</literal> must not be used anywhere in
+      the key and have a special meaning in the value.
      </simpara>
     </note>
     <para>