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+# [Advent of Code 2021](https://adventofcode.com/2021)
+
+## Progress
+
+-   [ ] Day 01
+-   [ ] Day 02
+-   [ ] Day 03
+-   [ ] Day 04
+-   [ ] Day 05
+-   [ ] Day 06
+-   [ ] Day 07
+-   [ ] Day 08
+-   [ ] Day 09
+-   [ ] Day 10
+-   [ ] Day 11
+-   [ ] Day 12
+-   [ ] Day 13
+-   [ ] Day 14
+-   [ ] Day 15
+-   [ ] Day 16
+-   [ ] Day 17
+-   [ ] Day 18
+-   [ ] Day 19
+-   [ ] Day 20
+-   [ ] Day 21
+-   [ ] Day 22
+-   [ ] Day 23
+-   [ ] Day 24
+-   [ ] Day 25
diff --git a/README.md b/README.md
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+++ b/README.md
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 # Advent of Code
 
 ## Index
-- [2015](2015/README.md)
-- [2016](2016/README.md)
-- [2017](2017/README.md)
-- [2018](2018/README.md)
-- [2019](2019/README.md)
-- [2020](2020/README.md)
+
+-   [2015](2015/README.md)
+-   [2016](2016/README.md)
+-   [2017](2017/README.md)
+-   [2018](2018/README.md)
+-   [2019](2019/README.md)
+-   [2020](2020/README.md)
+-   [2021](2021/README.md)