diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..4dd0f89
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "charts/webhook-freedns"]
+	path = charts/webhook-freedns
+	url = https://github.com/tgckpg/cert-manager-webhook-freedns.git
diff --git a/charts/webhook-freedns b/charts/webhook-freedns
new file mode 160000
index 0000000..74a7eb3
--- /dev/null
+++ b/charts/webhook-freedns
@@ -0,0 +1 @@
+Subproject commit 74a7eb382840d8bbbe93d10bcc2974785e2b2924