diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..838d87c
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "submodule"]
+	path = submodule
+	url = https://git.fanyx.xyz/fanyx/submodule
+	branch = 0.0.4
diff --git a/submodule b/submodule
new file mode 160000
index 0000000..c996f65
--- /dev/null
+++ b/submodule
@@ -0,0 +1 @@
+Subproject commit c996f654b91592176a41f3169ad4f3c296fdfb0b