diff --git a/reference/filesystem/constants.xml b/reference/filesystem/constants.xml
index e2ab163b38..8e20c18b75 100644
--- a/reference/filesystem/constants.xml
+++ b/reference/filesystem/constants.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='iso-8859-1'?>
-<!-- $Revision: 1.11 $ -->
+<!-- $Revision: 1.12 $ -->
 <appendix xml:id="filesystem.constants" xmlns="http://docbook.org/ns/docbook">
  &reftitle.constants;
  &extension.constants;
@@ -187,9 +187,15 @@
      (<type>integer</type>)
    </term>
    <listitem>
-    <simpara>
+    <para>
      Binary mode (since PHP 5.2.7).
-    </simpara>
+     <note>
+      <para>
+       This constant has no effect prior to PHP 6. It is only available for 
+       <literal>forward compatibility</literal>.
+      </para>
+     </note>
+    </para>
    </listitem>
   </varlistentry>
 
@@ -199,9 +205,15 @@
      (<type>integer</type>)
    </term>
    <listitem>
-    <simpara>
+    <para>
      Text mode (since PHP 5.2.7).
-    </simpara>
+     <note>
+      <para>
+       This constant has no effect prior to PHP 6. It is only available for 
+       <literal>forward compatibility</literal>.
+      </para>
+     </note>
+    </para>
    </listitem>
   </varlistentry>