diff --git a/1_Livepatch/1.0_livepatch_sample/README.md b/1_Livepatch/1.0_livepatch_sample/README.md
index 8a8c2a6..be05551 100644
--- a/1_Livepatch/1.0_livepatch_sample/README.md
+++ b/1_Livepatch/1.0_livepatch_sample/README.md
@@ -12,3 +12,5 @@
 * Check the output again of `cat /proc/cmdline`
 * Disable the livepatch with `echo 0 | sudo tee /sys/kernel/livepatch/livepatch-sample/enabled`
 * Unload from the kernel with `rmmod livepatch-sample.ko`
+
+> Tested on Ubuntu 20.04 running under Vagrant.