diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..d01dda7
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "NFD"]
+	path = NFD
+	url = https://github.com/named-data-ndnSIM/NFD