diff --git a/TODO.md b/TODO.md
index 49d1af7e8..800c4c621 100644
--- a/TODO.md
+++ b/TODO.md
@@ -5,3 +5,4 @@ This is just to keep track of what we need to do before 0.1:
   * A module system for better Terraform file organization. More details on this later.
   * Commands to inspect and manipulate plans and states.
   * Acceptance test framework if possible
+  * Need to limit parallelism of graph walk