diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..1bcca5b
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,6 @@
+[submodule "android/jni/lzma"]
+	path = android/jni/lzma
+	url = https://github.com/sisong/lzma.git
+[submodule "android/jni/HDiffPatch"]
+	path = android/jni/HDiffPatch
+	url = https://github.com/sisong/HDiffPatch.git
diff --git a/android/jni/HDiffPatch b/android/jni/HDiffPatch
new file mode 160000
index 0000000..eb959d6
--- /dev/null
+++ b/android/jni/HDiffPatch
@@ -0,0 +1 @@
+Subproject commit eb959d671cd94281ca763d609f638b5d248df3a3
diff --git a/android/jni/lzma b/android/jni/lzma
new file mode 160000
index 0000000..c80bb80
--- /dev/null
+++ b/android/jni/lzma
@@ -0,0 +1 @@
+Subproject commit c80bb80bbbac61da7ec02d12fb497851b1f59635