diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..6f8eec9
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "ideal-rmt-simulator"]
+	path = ideal-rmt-simulator
+	url = https://github.com/rfchang/ideal-rmt-simulator
diff --git a/ideal-rmt-simulator b/ideal-rmt-simulator
new file mode 160000
index 0000000..852153f
--- /dev/null
+++ b/ideal-rmt-simulator
@@ -0,0 +1 @@
+Subproject commit 852153f017ee785e79158a82d720a27288b150b7