diff --git a/README.rst b/README.rst
index 1e97333..6fb4886 100644
--- a/README.rst
+++ b/README.rst
@@ -661,7 +661,7 @@
 Disable Contrail API authentication
 -----------------------------------
 
-Contrail version must >=3.0. It is useful especially for Keystone v3.
+Contrail version must >= 3.0. It is useful especially for Keystone v3.
 
 .. code-block:: yaml
 
@@ -671,6 +671,21 @@
         multi_tenancy: false
       ...
 
+Switch from on demand to periodic keystone sync
+-----------------------------------------------
+
+This can be useful when you want to sync projects from OpenStack to Contrail
+automatically. The period of sync is 60s.
+
+.. code-block:: yaml
+
+    opencontrail:
+      ...
+      config:
+        identity:
+          sync_on_demand: false
+      ...
+
 Cassandra listen interface
 --------------------------
 
@@ -686,7 +701,7 @@
 
 OpenContrail WebUI version >= 3.1.1
 -----------------------------------
-For OpenContrail version >= 3.1.1 and Cassandra >=2.1 we should override WebUI's cassandra port from 9160 to 9042.
+For OpenContrail version >= 3.1.1 and Cassandra >= 2.1 we should override WebUI's cassandra port from 9160 to 9042.
 
 For appropriate node at class level:
 
@@ -746,7 +761,7 @@
 
 Basic parameters with identity and host configs
 
-.. code-block:: bash
+.. code-block:: yaml
 
   opencontrail:
     client:
@@ -761,7 +776,7 @@
 
 Enforcing virtual routers
 
-.. code-block:: bash
+.. code-block:: yaml
 
   opencontrail:
     client:
@@ -776,7 +791,7 @@
 
 Enforcing control nodes
 
-.. code-block:: bash
+.. code-block:: yaml
 
   opencontrail:
     client:
@@ -795,7 +810,7 @@
 
 Enforcing edge BGP routers
 
-.. code-block:: bash
+.. code-block:: yaml
 
   opencontrail:
     client:
@@ -812,7 +827,7 @@
 
 Enforcing config nodes
 
-.. code-block:: bash
+.. code-block:: yaml
 
   opencontrail:
     client:
@@ -825,7 +840,7 @@
 
 Enforcing database nodes
 
-.. code-block:: bash
+.. code-block:: yaml
 
   opencontrail:
     client:
@@ -838,7 +853,7 @@
 
 Enforcing analytics nodes
 
-.. code-block:: bash
+.. code-block:: yaml
 
   opencontrail:
     client:
diff --git a/opencontrail/files/3.0/contrail-keystone-auth.conf b/opencontrail/files/3.0/contrail-keystone-auth.conf
index 5619bf2..7b2a133 100644
--- a/opencontrail/files/3.0/contrail-keystone-auth.conf
+++ b/opencontrail/files/3.0/contrail-keystone-auth.conf
@@ -16,4 +16,5 @@
 auth_url=http://{{ config.identity.host }}:{{ config.identity.port }}/v3
 {%- else %}
 auth_url=http://{{ config.identity.host }}:{{ config.identity.port }}/v2.0
-{%- endif %}
\ No newline at end of file
+{%- endif %}
+keystone_sync_on_demand={{ config.identity.get('sync_on_demand', 'true') }}
\ No newline at end of file