diff --git a/bsvg/gtfs-de-retain-bsvg.txt b/bsvg/gtfs-de-retain-bsvg.txt
new file mode 100644
index 0000000..d56f102
--- /dev/null
+++ b/bsvg/gtfs-de-retain-bsvg.txt
@@ -0,0 +1 @@
+{"op":"retain","match":{"file":"agency.txt","agency_id":"12021"}}