diff --git a/reference/apache/functions/apache-getenv.xml b/reference/apache/functions/apache-getenv.xml
index c3151d7e5f..a02732fbce 100755
--- a/reference/apache/functions/apache-getenv.xml
+++ b/reference/apache/functions/apache-getenv.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='iso-8859-1'?>
-<!-- $Revision: 1.3 $ -->
+<!-- $Revision: 1.4 $ -->
   <refentry id="function.apache-getenv">
    <refnamediv>
     <refname>apache_getenv</refname>
@@ -17,6 +17,12 @@
      environment variable specified by <parameter>variable</parameter>, or
      &false; on failure.
     </para>
+    <note>
+     <para>
+      <function>apache_getenv</function> is only defined when using
+      Apache 2.
+     </para>
+    </note>
     <example>
      <title><function>apache_getenv</function> example</title>
      <programlisting role="php">
@@ -33,7 +39,9 @@ echo $ret;
      </para>
     </example>
     <para>
-     See also <function>apache_setenv</function>.
+     See also <function>apache_setenv</function>,
+     <function>getenv</function>&listendand;
+     <link linkend="language.variables.superglobals">Superglobals</link>.
     </para>
    </refsect1>
   </refentry>