diff --git a/README.md b/README.md
index 51c2966..b24f4c3 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ sudo dokku plugin:install https://github.com/dokku/dokku-postgres.git postgres
 ## commands
 
 ```
-postgres:backup <name> <bucket> [--use-iam] Create a backup of the postgres service to an existing s3 bucket
+postgres:backup <name> <bucket> (--use-iam) Create a backup of the postgres service to an existing s3 bucket
 postgres:backup-auth <name> <aws_access_key_id> <aws_secret_access_key> (<aws_default_region>) (<aws_signature_version>) (<endpoint_url>) Sets up authentication for backups on the postgres service
 postgres:backup-deauth <name>     Removes backup authentication for the postgres service
 postgres:backup-schedule <name> <schedule> <bucket> Schedules a backup of the postgres service
diff --git a/commands b/commands
index 1f9f69d..551d0b6 100755
--- a/commands
+++ b/commands
@@ -104,7 +104,7 @@ case "$1" in
       # shellcheck disable=SC2034
       declare desc="return $PLUGIN_COMMAND_PREFIX plugin help content"
       cat<<help_content
-    $PLUGIN_COMMAND_PREFIX:backup <name> <bucket>, Create a backup of the $PLUGIN_COMMAND_PREFIX service to an existing s3 bucket
+    $PLUGIN_COMMAND_PREFIX:backup <name> <bucket> (--use-iam), Create a backup of the $PLUGIN_COMMAND_PREFIX service to an existing s3 bucket
     $PLUGIN_COMMAND_PREFIX:backup-auth <name> <aws_access_key_id> <aws_secret_access_key> (<aws_default_region>) (<aws_signature_version>) (<endpoint_url>), Sets up authentication for backups on the $PLUGIN_COMMAND_PREFIX service
     $PLUGIN_COMMAND_PREFIX:backup-deauth <name>, Removes backup authentication for the $PLUGIN_COMMAND_PREFIX service
     $PLUGIN_COMMAND_PREFIX:backup-schedule <name> <schedule> <bucket>, Schedules a backup of the $PLUGIN_COMMAND_PREFIX service