diff --git a/go/flags/endtoend/vtbackup.txt b/go/flags/endtoend/vtbackup.txt
index bf3a9eb9690..31842910205 100644
--- a/go/flags/endtoend/vtbackup.txt
+++ b/go/flags/endtoend/vtbackup.txt
@@ -195,6 +195,7 @@ Flags:
       --remote_operation_timeout duration                           time to wait for a remote operation (default 15s)
       --restart_before_backup                                       Perform a mysqld clean/full restart after applying binlogs, but before taking the backup. Only makes sense to work around xtrabackup bugs.
       --s3_backup_aws_endpoint string                               endpoint of the S3 backend (region must be provided).
+      --s3_backup_aws_minimum_partsize int                          Minimum part size to use (default 5242880)
       --s3_backup_aws_region string                                 AWS region to use. (default "us-east-1")
       --s3_backup_aws_retries int                                   AWS request retries. (default -1)
       --s3_backup_force_path_style                                  force the s3 path style.
diff --git a/go/flags/endtoend/vtctld.txt b/go/flags/endtoend/vtctld.txt
index 8b1aa6f4a92..45235d95a48 100644
--- a/go/flags/endtoend/vtctld.txt
+++ b/go/flags/endtoend/vtctld.txt
@@ -110,6 +110,7 @@ Flags:
       --purge_logs_interval duration                                     how often try to remove old logs (default 1h0m0s)
       --remote_operation_timeout duration                                time to wait for a remote operation (default 15s)
       --s3_backup_aws_endpoint string                                    endpoint of the S3 backend (region must be provided).
+      --s3_backup_aws_minimum_partsize int                               Minimum part size to use (default 5242880)
       --s3_backup_aws_region string                                      AWS region to use. (default "us-east-1")
       --s3_backup_aws_retries int                                        AWS request retries. (default -1)
       --s3_backup_force_path_style                                       force the s3 path style.