diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..c0a50e1
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "treebird"]
+	path = treebird
+	url = https://git.nekobit.net/repos/treebird.git
diff --git a/treebird b/treebird
new file mode 160000
index 0000000..7b41f08
--- /dev/null
+++ b/treebird
@@ -0,0 +1 @@
+Subproject commit 7b41f083f141a9ac7ad1e1a5cc6e4053dc95143c