diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..895ceaf
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "external/libds"]
+	path = external/libds
+	url = git@dev.danilafe.com:Experiments/libds.git
diff --git a/external/libds b/external/libds
new file mode 160000
index 0000000..936b283
--- /dev/null
+++ b/external/libds
@@ -0,0 +1 @@
+Subproject commit 936b2835b28082d83f9716ffc2470ae0621ab52a