diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..bf7b494f
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "docs/_themes"]
+	path = docs/_themes
+	url = git://github.com/mitsuhiko/flask-sphinx-themes.git
diff --git a/docs/_themes b/docs/_themes
new file mode 160000
index 00000000..11cb6b51
--- /dev/null
+++ b/docs/_themes
@@ -0,0 +1 @@
+Subproject commit 11cb6b51c9ea3bc8f94afa3d7411b617f9db2570