README.md in kaname-0.5.0 vs README.md in kaname-0.5.1

@@ -24,9 +24,18 @@
   tenants:
     development: "admin"
     production: "member"
 ```
 
+You can also define `all_tenants` for config all tenants' authority.  
+If both tenants and all_tenants are setting, tenants is preferred.
+
+```yaml
+suzupy:
+  email: [e-mail]
+  all_tenants: member
+```
+
 You need to put a configuration file to home directory.
 
 ```sh
 % cat ~/.kaname
 auth_url: "http://your-openstack-auth-endpoint/v2.0"