diff --git a/rrlp-ephemeris/COPYING b/rrlp-ephemeris/COPYING
new file mode 100644
index 0000000..8d7088e
--- /dev/null
+++ b/rrlp-ephemeris/COPYING
@@ -0,0 +1,2 @@
+See the included gpl-2.0.txt or gpl-3.0.txt depending on your
+preferences.