diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..974bf66
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "engine"]
+	path = engine
+	url = https://code.rozk.net/RK/rk_engine.git
diff --git a/engine b/engine
new file mode 160000
index 0000000..b3547c9
--- /dev/null
+++ b/engine
@@ -0,0 +1 @@
+Subproject commit b3547c90f134cdcfb692c539cd38ea31312d953a