diff --git a/_includes/footer.html b/_includes/footer.html
index 1123ebc..17a08cb 100644
--- a/_includes/footer.html
+++ b/_includes/footer.html
@@ -7,5 +7,5 @@
 
   <p>&copy; {{ site.title }}, 2023</p>
 
-  <p><a href="{{ site.sourceurl }}">Website source</a></p>
+  <p><a href="{{ site.sourceurl }}" title="Last built at {{ "now" | date: "%Y-%m-%d %H:%M" }}">Website source</a></p>
 </footer>