diff --git a/TODO.md b/TODO.md
index 951a30a..1285363 100644
--- a/TODO.md
+++ b/TODO.md
@@ -5,5 +5,6 @@
 - [ ] Make all vector functions applicable to string functions and vice versa
 - [ ] Implement Calculus functions as seen in propeller
 - [ ] Implement Linear Algebra functions as specified in the previous papers
+- [ ] Add a function to sort a vector
 
 ## PushGP TODO
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