diff --git a/doc/source/getting_started/on_devstack.rst b/doc/source/getting_started/on_devstack.rst
index e13b2fc4d9..22b1d44cef 100644
--- a/doc/source/getting_started/on_devstack.rst
+++ b/doc/source/getting_started/on_devstack.rst
@@ -67,7 +67,7 @@ To use aodh alarms you need to enable ceilometer and aodh in devstack.
 Adding the following lines to `[[local|localrc]]` section of `local.conf`
 will enable the services::
 
-    CEILOMETER_BACKEND=mongodb
+    CEILOMETER_BACKENDS=gnocchi
     enable_plugin ceilometer https://opendev.org/openstack/ceilometer
     enable_plugin aodh https://opendev.org/openstack/aodh