diff --git a/.gitmodules b/.gitmodules
index 7553118..e4ce605 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -2,3 +2,6 @@
 	path = am-kernels
 	url = https://git.xinyang.life/xin/am-kernels.git
 	branch = dev
+[submodule "diffu"]
+	path = diffu
+	url = https://git.xinyang.life/xin/diffu.git
diff --git a/diffu b/diffu
new file mode 160000
index 0000000..0c590d2
--- /dev/null
+++ b/diffu
@@ -0,0 +1 @@
+Subproject commit 0c590d218be4b2df4f8f827a9fd40278c227a1ca