diff --git a/go/flags/endtoend/vttablet.txt b/go/flags/endtoend/vttablet.txt
index a09da5b87bc..af357ee474f 100644
--- a/go/flags/endtoend/vttablet.txt
+++ b/go/flags/endtoend/vttablet.txt
@@ -809,6 +809,8 @@ Usage of vttablet:
 	YAML file config for tablet
   --tablet_dir string
 	The directory within the vtdataroot to store vttablet/mysql files. Defaults to being generated by the tablet uid.
+  --tablet_discovery_concurrency int
+	concurrent tablet discoveries (default 1024)
   --tablet_filters value
 	Specifies a comma-separated list of 'keyspace|shard_name or keyrange' values to filter the tablets to watch
   --tablet_grpc_ca string