diff --git a/functions/network.xml b/functions/network.xml
index 0e384a8100..2fdfbe4532 100644
--- a/functions/network.xml
+++ b/functions/network.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.58 $ -->
+<!-- $Revision: 1.59 $ -->
  <reference id="ref.network">
   <title>Network Functions</title>
   <titleabbrev>Network</titleabbrev>
@@ -420,8 +420,8 @@ if (!$fp) {
      which corresponds to <parameter>service</parameter> for the
      specified <parameter>protocol</parameter> as per
      <filename>/etc/services</filename>.
-     <parameter>protocol</parameter> is either <literal>TCP</literal>
-     or <literal>UDP</literal>.
+     <parameter>protocol</parameter> is either <literal>"tcp"</literal>
+     or <literal>"udp"</literal> (in lowercase).
     </para>
     <para>
      See also: <function>getservbyport</function>.
@@ -447,8 +447,8 @@ if (!$fp) {
      <function>getservbyport</function> returns the Internet service
      associated with <parameter>port</parameter> for the specified
      <parameter>protocol</parameter> as per <filename>/etc/services</filename>.
-     <parameter>protocol</parameter> is either <literal>TCP</literal>
-     or <literal>UDP</literal>.
+     <parameter>protocol</parameter> is either <literal>"tcp"</literal>
+     or <literal>"udp"</literal> (in lowercase).
     </para>
     <para>
      See also: <function>getservbyname</function>.