Fix docs regarding service identity

README.md

@@ -62,7 +62,7 @@ For convenience, you can discard the `-u <SERVICE_ID>`. Now the service_id will
 
 To create a service identity you can use the following python example code:
 
-(this requires one of the following roles: `DATA_MANAGER`, `COORDINATOR` or `INVESTIGATOR`)
+(this requires one of the following roles: `DATA_MANAGER` on the project or `COORDINATOR` or `INVESTIGATOR` on the institute. Next it requires a user specific role `SERVICES_MANAGER`)
 ```python
 from igtcloud.client.core.auth import smart_auth
 from igtcloud.client.services import entities_service, set_auth
@@ -208,4 +208,4 @@ See [CHANGELOG](./CHANGELOG.md) for more info on what's been changed.
 
 ## Licenses
 
-See [LICENSE](./LICENSE)
+See [LICENSE](./LICENSE)