diff --git a/2022/README.md b/2022/README.md
index df4c5ce..bcce981 100644
--- a/2022/README.md
+++ b/2022/README.md
@@ -9,7 +9,7 @@ will keep it as zero-dependency as possible
 # checklist
 - [x] day 1
 - [x] day 2
-- [ ] day 3
+- [x] day 3
 - [ ] day 4
 - [ ] day 5
 - [ ] day 6