diff --git a/gir.js b/gir.js
index 7163ecc..3e97e4e 100644
--- a/gir.js
+++ b/gir.js
@@ -347,6 +347,8 @@ function addOffsetProperties(parsed) {
 	return worker(parsed).offsetted;
 }
 
+// TODO: Optimization pass to turn copy loops into copy commands
+
 // ([commandObjects]) → [offsetCommandObjects]
 function optimize(parsed) {
 	const optimizations = [
@@ -357,3 +359,9 @@ function optimize(parsed) {
 	return optimizations.reduce((IR, optimization) =>
 		optimization(IR), parsed);
 }
+
+// ------------------------------------------------------------------
+// Virtual machine
+// ------------------------------------------------------------------
+
+// TODO: Implement a brainfuck VM for running the optimized programs