diff --git a/compiler/src/prog8/StackVmMain.kt b/compiler/src/prog8/StackVmMain.kt
index 757972e19..10302a8c7 100644
--- a/compiler/src/prog8/StackVmMain.kt
+++ b/compiler/src/prog8/StackVmMain.kt
@@ -18,7 +18,7 @@ fun stackVmMain(args: Array<String>) {
     }
 
     val program = Program.load(args.first())
-    val vm = StackVm(traceOutputFile = null)
+    val vm = StackVm(traceOutputFile = "trace.txt")  // TODO null
     val dialog = ScreenDialog()
     vm.load(program, dialog.canvas)
     EventQueue.invokeLater {
diff --git a/compiler/src/prog8/stackvm/Program.kt b/compiler/src/prog8/stackvm/Program.kt
index b664caf66..b4d9a7270 100644
--- a/compiler/src/prog8/stackvm/Program.kt
+++ b/compiler/src/prog8/stackvm/Program.kt
@@ -275,6 +275,13 @@ class Program (val name: String,
 
 
     private fun connect() {
+
+        // TODO:  because of JUMP instructions, the below doesn't work
+        // you cannot link instructions with just 1 instruction flow
+        // because JUMPS to another place will cause a RETURN to return back to different locations depending on what's called it...
+        // probably just need a real instruction pointer (based on index?) and call stack.
+
+
         val it1 = program.iterator()
         val it2 = program.iterator()
         it2.next()