Fixed a typo and expanded the comment a bit
diff --git a/openstack/compute/v2/servers/requests.go b/openstack/compute/v2/servers/requests.go
index 0354ea2..127735e 100644
--- a/openstack/compute/v2/servers/requests.go
+++ b/openstack/compute/v2/servers/requests.go
@@ -554,7 +554,7 @@
 // option.
 type RescueOpts struct {
 	// AdminPass is the desired administrative password for the instance in
-	// RESCUE mode.
+	// RESCUE mode, if it's left blank the server will generate a password.
 	AdminPass string
 }