diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..7acf018
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "themes/hugo-theme-cactus-plus"]
+	path = themes/hugo-theme-cactus-plus
+	url = https://github.com/nodejh/hugo-theme-cactus-plus.git