diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..2c41edd
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "themes/stack"]
+	path = themes/stack
+	url = https://github.com/CaiJimmy/hugo-theme-stack/
diff --git a/themes/stack b/themes/stack
new file mode 160000
index 0000000..fddab05
--- /dev/null
+++ b/themes/stack
@@ -0,0 +1 @@
+Subproject commit fddab053628070668cd9c9eb0b96d9a6246fcc71