diff --git a/hub/calendar.php b/hub/calendar.php
index ab7ca3a..34558bb 100644
--- a/hub/calendar.php
+++ b/hub/calendar.php
@@ -346,6 +346,10 @@ include 'reserve.txt';
 If you wish to pick an available slot in the next 12 months then go directly to the <a aria-label="Go to the request page" href="<?php echo "${hubBaseurl}"; ?>request.php">request page</a>. 
 </p>
 
+<h3 id="workflow">Workflow</h3>
+<p>
+The HPR statistics are regenerated every 15 minutes and are available in <a aria-label="Go to the stats json page" href="<?php echo "${hubBaseurl}"; ?>stats.json">json format</a>. Note the format is liable to change without notice.</p>
+
 </main>
 
 <?php