diff --git a/README.md b/README.md
new file mode 100644
index 0000000..59a67fe
--- /dev/null
+++ b/README.md
@@ -0,0 +1,10 @@
+# retropilot-server
+This is a lesser fork of upstream retropilot-server.
+
+# Upstream
+This is forked from RetroPilot:
+
+* https://github.com/retropilot/retropilot-server
+
+See also  `README-upstream.md`.
+