diff --git a/TODO b/TODO
index a6cdae84a0..0b1b6c84ef 100644
--- a/TODO
+++ b/TODO
@@ -24,6 +24,15 @@ Janitorial Clean-ups:
 
 Features:
 
+* introduce DefaultSlice= or so in system.conf that allows changing where we
+  place our units by default, i.e. change system.slice to something
+  else. Similar, ManagerSlice= should exist so that PID1's own scope unit could
+  be moved somewhere else too. Finally machined and logind should get similar
+  options so that it is possible to move user session scopes and machines to a
+  different slice too by default. Usecase: people who want to put resources on
+  the entire system, with the exception of one specific service. See:
+  https://lists.freedesktop.org/archives/systemd-devel/2018-February/040369.html
+
 * check what setting the login shell to /bin/false vs. /sbin/nologin means and
   do the right thing in get_user_creds_clean() with it.