diff --git a/README.rst b/README.rst
index 44c8b67..d37b93f 100644
--- a/README.rst
+++ b/README.rst
@@ -193,3 +193,32 @@
             enabled: true
             strategy: ENCRYPT
             secret_key: secret
+
+Change default options using configmap template settings
+========================================================
+
+.. code-block:: yaml
+
+  ironic:
+    api:
+      configmap:
+        DEFAULT:
+          enabled_drivers: pxe_ipmitool
+          enabled_hardware_types: ipmi
+          enabled_boot_interfaces: pxe
+        api:
+          host_ip: 0.0.0.0
+          port: 6385
+          max_limit: 1000
+    conductor:
+      configmap:
+        DEFAULT:
+          enabled_drivers: pxe_ipmitool
+          enabled_hardware_types: ipmi
+          enabled_boot_interfaces: pxe
+        disk_partitioner:
+          check_device_interval: 1
+          check_device_max_retries: 20
+        disk_utils:
+          efi_system_partition_size: 200
+          bios_boot_partition_size: 1