diff --git a/.gitmodules b/.gitmodules
index ef9737d..55a98be 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -113,3 +113,6 @@
 [submodule "2021/redfast00"]
 	path = 2021/redfast00
 	url = https://github.com/redfast00/aoc2021
+[submodule "2021/JasperJanin"]
+	path = 2021/JasperJanin
+	url = https://github.com/JasperJanin/advent-of-code-2021
diff --git a/2021/JasperJanin b/2021/JasperJanin
new file mode 160000
index 0000000..6ee5b21
--- /dev/null
+++ b/2021/JasperJanin
@@ -0,0 +1 @@
+Subproject commit 6ee5b21925b208fe37c983ff841bd0d237ea1f23