diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index b486253..bf3fab2 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -15,3 +15,6 @@ Pull requests submitted through GitHub will be ignored.
 Bugs should be filed on Launchpad, not GitHub:
 
    https://bugs.launchpad.net/nfv-filters
+
+See `Filter scheduler#Writing your own filter <http://docs.openstack.org/developer/nova/filter_scheduler.html#writing-your-own-filter>`_
+to learn how to create your own filter for Nova Scheduler.
diff --git a/doc/source/usage.rst b/doc/source/usage.rst
index a807b45..1777857 100644
--- a/doc/source/usage.rst
+++ b/doc/source/usage.rst
@@ -1,7 +1,31 @@
 =====
 Usage
 =====
+Follow the `Installation <installation.html>`_ document first. This document
+describes how to install this project.
 
 To use nfv-filters in a project::
 
     import nfv_filters
+
+
+local.conf settings
+-------------------
+See `Configuring filters <http://docs.openstack.org/developer/nova/filter_scheduler.html#configuring-filters>`_
+to learn how to use configure Nova Scheduler filters.
+
+To make available a new filter in Nova, not located in Nova Scheduler default
+filters, you should add the file containing the filter class to the variable
+`scheduler_available_filters` in the default section::
+
+    [[post-config|$NOVA_CONF]]
+    [DEFAULT]
+    filter_scheduler.available_filters=nova.scheduler.filters.all_filters,nfv_filters.nova.scheduler.filters.aggregate_instance_type_filter
+
+To enable this filter in Nova Scheduler, add your filter to the variable
+`scheduler_default_filters`::
+
+    [[post-config|$NOVA_CONF]]
+    [DEFAULT]
+    scheduler_default_filters=RamFilter,ComputeFilter,AggregateInstanceTypeFilter
+