diff --git a/reference/datetime/dateperiod/construct.xml b/reference/datetime/dateperiod/construct.xml
index 571399e6ac..29e990435b 100644
--- a/reference/datetime/dateperiod/construct.xml
+++ b/reference/datetime/dateperiod/construct.xml
@@ -205,7 +205,7 @@ foreach ($period as $date) {
    Unbound numbers of repetitions as specified by ISO 8601 section 4.5
    "Recurring time interval" are not supported, i.e. neither passing
    <literal>"R/..."</literal> as <parameter>isostr</parameter> nor passing
-   &null; as <parameter>$end</parameter> would work.
+   &null; as <parameter>end</parameter> would work.
   </simpara>
  </refsect1>