diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..ba84131
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "code/aoc-2020"]
+	path = code/aoc-2020
+	url = https://dev.danilafe.com/Advent-of-Code/AdventOfCode-2020.git
diff --git a/code/aoc-2020 b/code/aoc-2020
new file mode 160000
index 0000000..661bcbb
--- /dev/null
+++ b/code/aoc-2020
@@ -0,0 +1 @@
+Subproject commit 661bcbb557bfd7c228341b2430efd5aa21de3878