diff --git a/todo.txt b/todo.txt
index 3d37e90..b9afec4 100644
--- a/todo.txt
+++ b/todo.txt
@@ -23,6 +23,9 @@
         - paused / step-wise
         - (scaled) real time
     - omniscient debugging
+    - coupled execution with "plant"
+    - MTL properties & checking of plant state
+    - recording and replaying traces
 
 
 TODO
@@ -30,10 +33,6 @@ TODO
 - bugs
     editing SC <-> Plant connections at runtime doesn't seem to work
 
-- testing
-    use STL for testing
-        https://github.com/mvcisback/py-metric-temporal-logic
-
 - maybe support:
     - explicit order of:
         - outgoing transitions?