diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..27217af
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "match42-secret"]
+	path = match42-secret
+	url = https://github.com/tjdwns5063/match42-secret.git
diff --git a/match42-secret b/match42-secret
new file mode 160000
index 0000000..3ecddc3
--- /dev/null
+++ b/match42-secret
@@ -0,0 +1 @@
+Subproject commit 3ecddc384e2aa748152c24ff2d69fae882943d11