diff --git a/README.md b/README.md
index 1780dd3..bcc0890 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,9 @@ RouterOS script distribution](https://www.youtube.com/watch?v=B9neG3oAhcY)
 including demonstation recorded live at [MUM Europe
 2019](https://mum.mikrotik.com/2019/EU/) in Vienna.
 
+*Be warned!* Some details changed. So see the presentation, then follow
+the steps below for up-to-date commands.
+
 ### The long way in detail
 
 The update script does server certificate verification, so first step is to