diff --git a/TODO.md b/TODO.md
index 0aef0ab..ccc30dd 100644
--- a/TODO.md
+++ b/TODO.md
@@ -20,7 +20,7 @@ Roadmap for fixes and features.
 ## Internals
  - Non-recursive treeify
  - Faster factorial function. Maybe use gamma instead?
- - Remove extra calls to `.clone()`
+ - Remove extra calls to `.clone()` in quantity module
  - Arbitrary precision float (rug doesn't offer arbitrary exponents)