diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..da2dccf
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "rechnung_sty"]
+	path = rechnung_sty
+	url = https://git.nr18.space/qbi/rechnung.sty
diff --git a/rechnung_sty b/rechnung_sty
new file mode 160000
index 0000000..6d0d245
--- /dev/null
+++ b/rechnung_sty
@@ -0,0 +1 @@
+Subproject commit 6d0d24599de1cf509ccef42a398d06519f890cc4