diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..f6f54f3
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "toy_experiments"]
+	path = toy_experiments
+	url = https://github.com/jinhojsk515/RSM_gradient_estimator
diff --git a/toy_experiments b/toy_experiments
new file mode 160000
index 0000000..df706a1
--- /dev/null
+++ b/toy_experiments
@@ -0,0 +1 @@
+Subproject commit df706a12b4645c3a190d6e541b23db8410adcc95