diff --git a/README.rst b/README.rst
index db30e37..e678e66 100644
--- a/README.rst
+++ b/README.rst
@@ -169,6 +169,14 @@
 - ``galera_error_log_path``
    Default is ``/var/log/mysql/error.log``
 
+When the following parameters are set to 0, theirs
+defaults will be calclulated automatically based on number
+of cpu cores:
+
+ - galera_innodb_read_io_threads
+ - galera_innodb_write_io_threads
+ - galera_wsrep_slave_threads
+
 Usage:
 
 .. code-block:: yaml