diff --git a/overlay.d/05core/usr/lib/systemd/system/emergency.service.d/coreos-sulogin-force.conf b/overlay.d/05core/usr/lib/systemd/system/emergency.service.d/coreos-sulogin-force.conf
index 6d864aea37..390f72723f 100644
--- a/overlay.d/05core/usr/lib/systemd/system/emergency.service.d/coreos-sulogin-force.conf
+++ b/overlay.d/05core/usr/lib/systemd/system/emergency.service.d/coreos-sulogin-force.conf
@@ -1,6 +1,7 @@
 # https://github.com/coreos/coreos-installer/commit/15a79263d0bd5d72056a6080f6687dc10cba2dda
 # https://github.com/systemd/systemd/pull/10397
-# We want `systemd.unit=emergency.target` to Just Work even with our locked
-# root account.
+# We want things like `systemd.unit=emergency.target` and `single` on the 
+# kernel command line to just work even with our locked root account.
+# This file is used as an override for both emergency.target and rescue.target.
 [Service]
 Environment=SYSTEMD_SULOGIN_FORCE=1