diff --git a/website/source/docs/provisioners/salt-masterless.html.md b/website/source/docs/provisioners/salt-masterless.html.md
index adcc4a517..e8d391617 100644
--- a/website/source/docs/provisioners/salt-masterless.html.md
+++ b/website/source/docs/provisioners/salt-masterless.html.md
@@ -66,6 +66,10 @@ Optional:
     uploaded to the `/etc/salt` on the remote. This option overrides the
     `remote_state_tree` or `remote_pillar_roots` options.
 
+- `grains_file` (string) - The path to your local [grains file]
+    (https://docs.saltstack.com/en/latest/topics/grains). This will be
+    uploaded to `/etc/salt/grains` on the remote.
+
 - `skip_bootstrap` (boolean) - By default the salt provisioner runs [salt
     bootstrap](https://github.com/saltstack/salt-bootstrap) to install salt. Set
     this to true to skip this step.