diff --git a/.gitmodules b/.gitmodules
index ec384dc38..dea570e31 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -48,3 +48,6 @@
 [submodule "extensions-builtin/a1111-sd-webui-lycoris"]
 	path = extensions-builtin/a1111-sd-webui-lycoris
 	url = https://github.com/KohakuBlueleaf/a1111-sd-webui-lycoris
+[submodule "extensions-builtin/multidiffusion-upscaler-for-automatic1111"]
+	path = extensions-builtin/multidiffusion-upscaler-for-automatic1111
+	url = https://github.com/pkuliyi2015/multidiffusion-upscaler-for-automatic1111
diff --git a/extensions-builtin/multidiffusion-upscaler-for-automatic1111 b/extensions-builtin/multidiffusion-upscaler-for-automatic1111
new file mode 160000
index 000000000..71dd5c539
--- /dev/null
+++ b/extensions-builtin/multidiffusion-upscaler-for-automatic1111
@@ -0,0 +1 @@
+Subproject commit 71dd5c539050cae86ba23eee29239ac7a4432360