diff --git a/TODO.md b/TODO.md
index 3438b51..53c8180 100644
--- a/TODO.md
+++ b/TODO.md
@@ -10,8 +10,8 @@
 - [x] Lifelines
 - [x] Different types of participants
 - [x] Notes
-- [ ] Synchronized arrows
-- [ ] Slanted arrows
+- [x] Synchronized arrows
+- [x] Slanted arrows
 - [ ] Different types of arrow tips (WIP)
 - [ ] Fix column spacing with notes over multiple columns
 - [ ] Fix notes with arrows from start / to end / small arrows