diff --git a/reference/filesystem/functions/fwrite.xml b/reference/filesystem/functions/fwrite.xml
index e4c5412f37..a847491d5a 100644
--- a/reference/filesystem/functions/fwrite.xml
+++ b/reference/filesystem/functions/fwrite.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.17 $ -->
+<!-- $Revision: 1.18 $ -->
 <refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.fwrite">
  <refnamediv>
   <refname>fwrite</refname>
@@ -89,6 +89,26 @@
     interruption.
    </para>
   </note>
+  <note>
+   <para>
+    If writing twice to the file pointer, then the data will be appended to 
+    the end of the file content, meaning that the example below wouldn't work 
+    as expected:
+
+        <programlisting role="php">
+<![CDATA[
+<?php
+$fp = fopen('data.txt', 'w');
+fwrite($fp, '1');
+fwrite($fp, '23');
+fclose($fp);
+
+// the content of 'data.txt' is now 123 and not 23!
+?>
+]]>
+        </programlisting>
+   </para>
+  </note>
  </refsect1>
 
  <refsect1 role="examples">