diff --git a/add-subtree.sh b/add-subtree.sh
new file mode 100644
index 0000000..9c71298
--- /dev/null
+++ b/add-subtree.sh
@@ -0,0 +1,5 @@
+# add
+git subtree add --prefix lib/com.daplie.walnut ../../ns1.daplie.me/walnut.bak/packages/pages/com.daplie.walnut/ master --squash
+
+# update
+git subtree pull --prefix lib/com.daplie.walnut ../../ns1.daplie.me/walnut.bak/packages/pages/com.daplie.walnut/ master --squash