diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..fec30cac
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "librw"]
+	path = librw
+	url = https://github.com/aap/librw
diff --git a/librw b/librw
new file mode 160000
index 00000000..7bd6d464
--- /dev/null
+++ b/librw
@@ -0,0 +1 @@
+Subproject commit 7bd6d4649e575e0a2a5f046fdf0d687cea87ca84