diff --git a/tsa/howto/new-machine-hetzner-robot.mdwn b/tsa/howto/new-machine-hetzner-robot.mdwn
index 24a3bf9bd61ab98e464e195091bc0bd069f0867c..7f78ddb9c115a7cbd586ebcfcd5e56726a0f00f6 100644
--- a/tsa/howto/new-machine-hetzner-robot.mdwn
+++ b/tsa/howto/new-machine-hetzner-robot.mdwn
@@ -80,6 +80,9 @@ which we'll use below.
             --mirror https://mirror.hetzner.de/debian/packages/ \
             --remove-configs --defaultinterfaces
 
+    Note: last time this was ran, `udev` was not installed which led
+    to some problems, see [Debian #931235](https://bugs.debian.org/931235).
+
  4. Once the bootstrapping is complete, you still need to make sure
     the system can boot as, the above doesn't (unfortunately)
     configure everything for you. First, fix the mountpoints: