diff --git a/protocol/errors.json b/protocol/errors.json
index 3c236c1..1b2bb03 100644
--- a/protocol/errors.json
+++ b/protocol/errors.json
@@ -25,6 +25,7 @@
   "40019": "Required client library plugin not present",
   "40020": "Batch error",
   "40021": "Feature requires a newer platform version",
+  "40022": "API Streamer has been shut down",
   "40030": "Invalid publish request (unspecified)",
   "40031": "Invalid publish request (invalid client-specified id)",
   "40032": "Invalid publish request (impermissible extras field)",