diff --git a/doc/manual/_templates/layout.html b/doc/manual/_templates/layout.html
index 1de6c4244..9ed4dff25 100644
--- a/doc/manual/_templates/layout.html
+++ b/doc/manual/_templates/layout.html
@@ -11,4 +11,8 @@
 			} catch(e) {} }),
 			false);
 })();</script>
+
+<div style="background-color: #FFBABA; color: #6A0E0E; position: fixed; min-width: 768px; top: 0; width: 100%; padding: 8px 20px 8px; font-size: 14px; line-height: 1.6; text-align: center; z-index: 300">
+WARNING: This document is for an old version of ARTIQ. For the most recent release go to <a href="https://m-labs.hk/artiq/manual/">https://m-labs.hk/artiq/manual/</a>.
+</div>
 {% endblock %}