diff --git a/runtime.c b/runtime.c
index 98473c3b..1a2ecfd2 100644
--- a/runtime.c
+++ b/runtime.c
@@ -36,7 +36,17 @@ object Cyc_global_set2(void *thd, object cont, object * glo, object value)
   value = share_object(thd, NULL, value, &do_gc);
   gc_mut_update((gc_thread_data *) thd, *glo, value);
   *(glo) = value;
+  // TODO: if we don't do this how does GC know to transport the global??
+  // don't really want to do this though because it is a performance nightmare
+  // can we use add_mutation and add cvar as a case when transporting mutations?
   ((gc_thread_data *) thd)->globals_changed = 1; // No longer needed??
+/*
+in order to get rid of the above I think we need to find the corresponding cvar and ensure it is a root
+in the upcoming GC. or if there is no GC scheduled, just update it directly now
+*/
+
+// TODO: not applicable here but after all entry_pts are executed the app should run a minor gc to get globals off the stack!
+
   if (do_gc) {
     object buf[1]; buf[0] = value;
     GC(thd, cont, buf, 1);