diff --git a/reference/sockets/functions/socket-get-option.xml b/reference/sockets/functions/socket-get-option.xml
index 2674ef2c2c..68466afa5a 100644
--- a/reference/sockets/functions/socket-get-option.xml
+++ b/reference/sockets/functions/socket-get-option.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.10 $ -->
+<!-- $Revision: 1.11 $ -->
 <refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.socket-get-option">
  <refnamediv>
   <refname>socket_get_option</refname>
@@ -29,6 +29,7 @@
      <term><parameter>socket</parameter></term>
      <listitem>
       <para>
+       A valid socket resource created with <function>socket_create</function>.
       </para>
      </listitem>
     </varlistentry>