diff --git a/TODO.md b/TODO.md
index 736f74b..4dfe4ed 100644
--- a/TODO.md
+++ b/TODO.md
@@ -4,3 +4,5 @@
  - Linked List (variant with sentinels instead of the current one)
  - Hash Map
  - Binary Tree
+- Remove duplication between sorting/display.js and
+  dataStructures/display.js (and the tests)