diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000000..df3b751b4fe
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "experiments/kotlin-ir"]
+	path = experiments/kotlin-ir
+	url = git@github.com:JetBrains/kotlin.git
+	branch = rr/pdn_ir_prototype
diff --git a/experiments/kotlin-ir b/experiments/kotlin-ir
new file mode 160000
index 00000000000..77b8a2c4e4d
--- /dev/null
+++ b/experiments/kotlin-ir
@@ -0,0 +1 @@
+Subproject commit 77b8a2c4e4dd8670c79679801544ff736f35299c