diff --git a/README.rst b/README.rst
index a3a507c..6c97682 100644
--- a/README.rst
+++ b/README.rst
@@ -895,6 +895,30 @@
           max_retries: '-1'
           max_overflow: 40
 
+Configure cinder to use service user tokens:
+========
+Long-running operations such as snapshot can sometimes overrun the expiry of the user token.
+In such cases, post operations such as cleaning up after a snapshot can fail when the
+cinder service needs to cleanup resources.
+
+This pillar enables cinder to use service user tokens to supplement the regular user token
+used to initiate the operation. The identity service (keystone) will then authenticate
+a request using the service user token if the user token has already expired.
+
+.. code-block:: yaml
+
+   cinder:
+     controller:
+     enabled: True
+     ...
+       service_user:
+         enabled: True
+         auth_type: password
+         user_domain_id: default
+         project_domain_id: default
+         project_name: service
+         username: cinder
+         password: pswd
 
 Upgrades
 ========