diff --git a/.gitmodules b/.gitmodules
index 9925c7e..3efc8cb 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -122,3 +122,6 @@
 [submodule "2021/niknetniko"]
 	path = 2021/niknetniko
 	url = https://github.com/niknetniko/AdventOfCode.git
+[submodule "2021/francis"]
+	path = 2021/francis
+	url = https://github.com/fbegyn/aoc2021
diff --git a/2021/francis b/2021/francis
new file mode 160000
index 0000000..6a76cd3
--- /dev/null
+++ b/2021/francis
@@ -0,0 +1 @@
+Subproject commit 6a76cd3e09c5470601201fe9dccb280e84a4b505