diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..d9ddfc3
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "backend/pro"]
+	path = backend/pro
+	url = git@github.com:chaitin/MonkeyCodePro.git
diff --git a/backend/pro b/backend/pro
new file mode 160000
index 0000000..7206289
--- /dev/null
+++ b/backend/pro
@@ -0,0 +1 @@
+Subproject commit 72062891c0d2b879acd1d675f41179130d6d0018