diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..4db6342
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,6 @@
+[submodule "themes/hugo-theme-stack"]
+	path = themes/hugo-theme-stack
+	url = https://github.com/CaiJimmy/hugo-theme-stack/
+[submodule "wiki-hemera/themes/hugo-theme-stack"]
+	path = wiki-hemera/themes/hugo-theme-stack
+	url = https://github.com/CaiJimmy/hugo-theme-stack/
diff --git a/wiki-hemera/themes/hugo-theme-stack b/wiki-hemera/themes/hugo-theme-stack
new file mode 160000
index 0000000..6f1d676
--- /dev/null
+++ b/wiki-hemera/themes/hugo-theme-stack
@@ -0,0 +1 @@
+Subproject commit 6f1d676948b2e452cd13c5505095da3ebaea262b