diff --git a/TODO b/TODO
index 6bff189..2ac760c 100644
--- a/TODO
+++ b/TODO
@@ -1,7 +1,7 @@
 - guard rail tests for nonexistent lookups in manager classes
 - custom exception for nonexistent Entity ID
 - custom exception for nonexistent Component ID
-- test component activation
-- test component deactivation
-- test component removal
-- test entity destroy
+
+- special Engine kinds (detector, modifier, spawner)
+
+- docs