diff --git a/.gitmodules b/.gitmodules
index 3749003..fd34680 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -28,3 +28,6 @@
 [submodule "mpiergal"]
 	path = mpiergal
 	url = https://github.com/MarioPiergallini/sp2014.11-731.git
+[submodule "jdoornbos"]
+	path = jdoornbos
+	url = https://github.com/jdoornbos/sp2014.11-731.git
diff --git a/jdoornbos b/jdoornbos
new file mode 160000
index 0000000..4fdd035
--- /dev/null
+++ b/jdoornbos
@@ -0,0 +1 @@
+Subproject commit 4fdd035f2c4f358674d399932791178fff976b93