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..4003fa1
--- /dev/null
+++ b/external/libds
@@ -0,0 +1 @@
+Subproject commit 4003fa1b78360a517ef72f4a44c871981efe2692