diff --git a/nixos/modules/testing/test-instrumentation.nix b/nixos/modules/testing/test-instrumentation.nix
index 8461a7472d2b..3ec4fdc0e2a0 100644
--- a/nixos/modules/testing/test-instrumentation.nix
+++ b/nixos/modules/testing/test-instrumentation.nix
@@ -1,5 +1,5 @@
 # This module allows the test driver to connect to the virtual machine
-# via a root shell attached to port 514.
+# via a root shell attached to a virtio console.
 
 {
   options,