diff --git a/.gitmodules b/.gitmodules
index b88e977..5052a10 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -70,3 +70,6 @@
 [submodule "2021/aoc2021"]
 	path = 2021/chvp
 	url = https://github.com/chvp/aoc2021
+[submodule "2021/robbe"]
+	path = 2021/robbe
+	url = git@github.com:Robbe7730/adventofcode2021.git
diff --git a/2021/robbe b/2021/robbe
new file mode 160000
index 0000000..6a307ca
--- /dev/null
+++ b/2021/robbe
@@ -0,0 +1 @@
+Subproject commit 6a307ca5fce99e3f838750c5a8bd82c5bd356778
diff --git a/README.md b/README.md
index 70d041c..08aca72 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,7 @@
 | :------------- | :-----------------------------------------------: | ---------: |
 | chvp           | https://github.com/chvp/aoc2021                   | ?          |
 | ninewise       | https://git.fuyu.moe/ninewise/adventofcode-2021   | ?          |
+| robbe          | git@github.com:Robbe7730/adventofcode2021.git     | ?          |
 | Flynn          | https://gitlab.com/mcbloch/aoc2021                | ?          |
 
 * repo clonen: