Fix files permissions

Fixes-bug: PROD-36506
Change-Id: Ia50bd3de91dc50cda36cc07ae7b362ecbef08604
diff --git a/README.rst b/README.rst
index c0330db..86dd6a0 100644
--- a/README.rst
+++ b/README.rst
@@ -1067,6 +1067,37 @@
           backend: mysql
 
 
+Change files/directories permissions for cinder service:
+=======================================
+In order to change file permissions the following should be set:
+
+'files' - block to set permissions for files.
+- full path to file
+- user ( default value is 'root' ) this parameter is optional.
+- group ( default value is 'cinder' ) this parameter is optional
+- mode ( default value is '0640' ) this parameter is optional
+
+'directories' - block to set permissions for directories.
+- full path to directory
+- user ( default value is 'root' ) this parameter is optional
+- group ( default value is 'cinder' ) this parameter is optional
+- mode ( default value is '0750' ) this parameter is optional
+
+.. code-block:: yaml
+
+    cinder:
+      files:
+        /etc/cinder/cinder.conf:
+          user: 'root'
+          group: 'cinder'
+          mode: '0750'
+      directories:
+        /etc/cinder:
+          user: 'root'
+          group: 'cinder'
+          mode: '0750'
+
+
 Upgrades
 ========