diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..0bef958
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "google-tests/libnpy"]
+	path = google-tests/libnpy
+	url = https://github.com/llohse/libnpy.git
diff --git a/google-tests/libnpy b/google-tests/libnpy
new file mode 160000
index 0000000..471fe48
--- /dev/null
+++ b/google-tests/libnpy
@@ -0,0 +1 @@
+Subproject commit 471fe480d5f1082fd8fd0e746eaf10084a2fb82b