diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..7714b87
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,12 @@
+[submodule "lectures"]
+	path = lectures
+	url = ./beamerthemes
+[submodule "ouexam"]
+	path = ouexam
+	url = ./ouexam
+[submodule "beamerthemes"]
+	path = beamerthemes
+	url = ./beamerthemes
+[submodule "listings"]
+	path = listings
+	url = ./listings/