diff --git a/reference/datetime/datetime/construct.xml b/reference/datetime/datetime/construct.xml
index caf47c3a4c..bb59902cc5 100644
--- a/reference/datetime/datetime/construct.xml
+++ b/reference/datetime/datetime/construct.xml
@@ -29,7 +29,11 @@
       String in a format accepted by <function>strtotime</function>.
      </para>
      <para>
-      To use a UNIX timestamp, put a <literal>@</literal> on the
+      Enter &null; here to obtain the current time when using
+      the <parameter>$timezone</parameter> parameter.
+     </para>
+     <para>
+      To use a UNIX timestamp, put a <literal>@</literal> in
       front of the timestamp string.
      </para>
     </listitem>
@@ -43,11 +47,18 @@
      </para>
      <para>
       If <parameter>$timezone</parameter> is omitted,
-      the current timezone will be used. The <parameter>$timezone</parameter>
-      parameter will be ignored if a timezone is specified in the
-      <parameter>$time</parameter> parameter (e.g. using
-      <literal>2010-01-28T15:00:00+02:00</literal>).
+      the current timezone will be used.
      </para>
+     <note>
+      <para>
+       The <parameter>$timezone</parameter> parameter
+       and the current timezone are ignored when the
+       <parameter>$time</parameter> parameter either
+       is a UNIX timestamp (e.g. <literal>@946684800</literal>)
+       or specifies a timezone
+       (e.g. <literal>2010-01-28T15:00:00+02:00</literal>).
+      </para>
+     </note>
     </listitem>
    </varlistentry>
   </variablelist>