diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 000000000..e38d44b0a
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "en/_theme"]
+	path = en/_theme
+	url = https://github.com/doctrine/doctrine-sphinx-theme.git
diff --git a/en/_theme b/en/_theme
new file mode 160000
index 000000000..e0bbe47f4
--- /dev/null
+++ b/en/_theme
@@ -0,0 +1 @@
+Subproject commit e0bbe47f444a68e2a37a442dd1e2a07c9d31dd5b