diff --git a/readme.md b/readme.md
index 3e3abee..73f2070 100644
--- a/readme.md
+++ b/readme.md
@@ -6,3 +6,6 @@ the years I've participated (to whatever extent).
 + [2019](./2019)
 + [2018](./2018)
 + [2017](./2017)
+	
+
+[aoc]: https://adventofcode.com