diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000000..241c169c47
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,8 @@
+[submodule "tests"]
+	path = tests/testdata
+	url = https://github.com/ethereum/tests
+	shallow = true
+[submodule "evm-benchmarks"]
+	path = tests/evm-benchmarks
+	url = https://github.com/ipsilon/evm-benchmarks
+	shallow = true