diff --git a/.gitmodules b/.gitmodules
index 3efc8cb..50b4092 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -125,3 +125,6 @@
 [submodule "2021/francis"]
 	path = 2021/francis
 	url = https://github.com/fbegyn/aoc2021
+[submodule "2021/mraedis"]
+	path = 2021/mraedis
+	url = https://github.com/Mraedis/AoC2021/
diff --git a/2021/mraedis b/2021/mraedis
new file mode 160000
index 0000000..25cba1c
--- /dev/null
+++ b/2021/mraedis
@@ -0,0 +1 @@
+Subproject commit 25cba1cc47ca8bb729212c23dc6b664d375f5b11