diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..c54c9ab
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "actsim"]
+	path = actsim
+	url = git@github.com:asyncvlsi/actsim.git
diff --git a/actsim b/actsim
new file mode 160000
index 0000000..76f0942
--- /dev/null
+++ b/actsim
@@ -0,0 +1 @@
+Subproject commit 76f0942741c16c8e8a2f17db03f63d01ba59ca3e