diff --git a/.gitmodules b/.gitmodules
index 55a98be..59dc115 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -116,3 +116,6 @@
 [submodule "2021/JasperJanin"]
 	path = 2021/JasperJanin
 	url = https://github.com/JasperJanin/advent-of-code-2021
+[submodule "2021/jaspervdj"]
+	path = 2021/jaspervdj
+	url = https://github.com/jaspervdj/advent-of-code
diff --git a/2021/jaspervdj b/2021/jaspervdj
new file mode 160000
index 0000000..146d61e
--- /dev/null
+++ b/2021/jaspervdj
@@ -0,0 +1 @@
+Subproject commit 146d61e3b34fc1c6430fb160c29c1473b251c6dd