diff --git a/appendices/filters.xml b/appendices/filters.xml
index 5211dc71b2..3d8b7a4d3f 100644
--- a/appendices/filters.xml
+++ b/appendices/filters.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.7 $ -->
+<!-- $Revision: 1.8 $ -->
 <appendix id="filters">
  <title>List of Available Filters</title>
  <para>
@@ -277,14 +277,13 @@ fwrite($fp, "This is a test.\n");
    </simpara>
   </note>
 
-  <note>
-   <simpara>
-    The zlib.* filters are not currently built into the PHP core.  To enable these filters
-    in <literal>PHP 5</literal>, install the <ulink url="&url.pecl.package;zlib_filter">zlib_filter</ulink>
+  <simpara>
+    zlib.* compression filters are available with PHP as of version <literal>5.1.0</literal> if
+    <xref linkend="zlib"/> support is enabled.  They are also available as a backport in version
+    <literal>5.0.x</literal> by installing the <ulink url="&url.pecl.package;zlib_filter">zlib_filter</ulink>
     package from <ulink url="&url.pecl;">PECL</ulink>.  These filters are <emphasis>not</emphasis>
     available for <literal>PHP 4</literal>.
-   </simpara>
-  </note>
+  </simpara>
 
   <example>
    <title>