diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..f01a1b2
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "tests/vlog_tb_utils"]
+	path = tests/vlog_tb_utils
+	url = https://github.com/fusesoc/vlog_tb_utils
diff --git a/tests/vlog_tb_utils b/tests/vlog_tb_utils
new file mode 160000
index 0000000..c47b7bb
--- /dev/null
+++ b/tests/vlog_tb_utils
@@ -0,0 +1 @@
+Subproject commit c47b7bb66ce302fd3431b49b843e0d1cb22350f9