diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..e9cd691
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "zgen"]
+	path = zgen
+	url = https://github.com/tarjoilija/zgen
diff --git a/zgen b/zgen
new file mode 160000
index 0000000..734ba1a
--- /dev/null
+++ b/zgen
@@ -0,0 +1 @@
+Subproject commit 734ba1a2d861981b82629b8dada244e641767761