diff --git a/TODO b/TODO
index 6330d495f2..6755078aef 100644
--- a/TODO
+++ b/TODO
@@ -43,6 +43,10 @@ Before 220:
 
 Features:
 
+* mounting and unmounting mount points manually with different source
+  devices will result in collected collected on all devices used.
+  http://lists.freedesktop.org/archives/systemd-devel/2015-April/030225.html
+
 * whe should apply a stop limit (similar to the existing start limit),
   so that we don't enter unbounded umount loops:
   http://lists.freedesktop.org/archives/systemd-devel/2015-April/030224.html