diff --git a/appengine/flexible/wordpress/README.md b/appengine/flexible/wordpress/README.md
index f8fc36b5e2..66d467bbab 100644
--- a/appengine/flexible/wordpress/README.md
+++ b/appengine/flexible/wordpress/README.md
@@ -63,7 +63,7 @@ for more details.
 Then change the root password for your instance:
 
 ```
-$ gcloud sql users set-password root % \
+$ gcloud sql users set-password root --host=% \
   --instance wp --password=YOUR_INSTANCE_ROOT_PASSWORD # Don't use this password!
 ```