diff --git a/reference/http/functions/responses/http-send-last-modified.xml b/reference/http/functions/responses/http-send-last-modified.xml
index c3de533ede..2d90954d14 100644
--- a/reference/http/functions/responses/http-send-last-modified.xml
+++ b/reference/http/functions/responses/http-send-last-modified.xml
@@ -10,7 +10,7 @@
   &reftitle.description;
   <methodsynopsis>
    <type>bool</type><methodname>http_send_last_modified</methodname>
-   <methodparam choice="opt"><type>int</type><parameter>timestamp</parameter></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>timestamp</parameter><initializer>time()</initializer></methodparam>
   </methodsynopsis>
   <para>
    Send a <literal>Last-Modified</literal> header with a valid HTTP date.