diff --git a/.gitmodules b/.gitmodules
index b3e1044..4f73a18 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -34,3 +34,6 @@
 [submodule "seafile-client"]
 	path = seafile-client
 	url = https://aur.archlinux.org/seafile-client.git
+[submodule "downgrade"]
+	path = downgrade
+	url = ./downgrade
diff --git a/downgrade b/downgrade
new file mode 160000
index 0000000..4f7a5c1
--- /dev/null
+++ b/downgrade
@@ -0,0 +1 @@
+Subproject commit 4f7a5c130257e362126468912b8637fa8da0c748