diff --git a/TODO.md b/TODO.md
index cd534b5..a152032 100644
--- a/TODO.md
+++ b/TODO.md
@@ -34,8 +34,11 @@
 - [ ] `rm` 
 - [ ] `touch`
 - [ ] `cat`
+- [ ] `tac`
 - [ ] `grep`
 - [ ] `cp`
 - [ ] `mv`
 - [ ] `head`
 - [ ] `tail`
+- [x] `yes`
+- [ ] `ed`