diff --git a/TODO b/TODO
index f5954b7..cbfb08a 100644
--- a/TODO
+++ b/TODO
@@ -9,6 +9,9 @@
 * Make a way to express that a Property can be reverted (ie, installing a
   packages reverses to removing it). Then `reverted property` can be
   used to disable old properties.
+* Currently only Debian and derivatives are supported by most Properties.
+  One way to improve that would be to parameterize Properties with a
+  Distribution witness.
 * Display of docker container properties is a bit wonky. It always
   says they are unchanged even when they changed and triggered a
   reprovision.