diff --git a/functions/math.xml b/functions/math.xml
index dbeadeee76..383882607a 100644
--- a/functions/math.xml
+++ b/functions/math.xml
@@ -943,6 +943,16 @@ $randval = mt_rand();
     <simpara>
      Returns an approximation of pi.
     </simpara>
+   <para>
+    <informalexample>
+     <programlisting>
+
+echo pi();
+// echo's 3.1415926535898
+
+     </programlisting>
+    </informalexample>
+   </para>
    </refsect1>
   </refentry>