diff --git a/TODO.md b/TODO.md
new file mode 100644
index 0000000..a9a6f7f
--- /dev/null
+++ b/TODO.md
@@ -0,0 +1,3 @@
+- entities should probably belong to room instead of layer
+- don't tick entities without any ticking traits
+- ~~production build~~
diff --git a/TODO.txt b/TODO.txt
deleted file mode 100644
index 640a61f..0000000
--- a/TODO.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-entities should probably belong to room instead of layer
-don't tick entities without any ticking traits
-production build