diff --git a/manifests/auth_file.pp b/manifests/auth_file.pp
index e6ca128..6f697f1 100644
--- a/manifests/auth_file.pp
+++ b/manifests/auth_file.pp
@@ -81,13 +81,13 @@
 #   (Optional) File path
 #   Defaults to '/root/openrc'.
 #
-# [*project_domain*]
+# [*project_domain_name*]
 #   (Optional) Project domain in v3 api.
-#   Defaults to 'default'.
+#   Defaults to 'Default'.
 #
-# [*user_domain*]
+# [*user_domain_name*]
 #   (Optional) User domain in v3 api.
-#   Defaults to 'default'.
+#   Defaults to 'Default'.
 #
 # [*auth_type*]
 #   (Optional) Authentication type to load.
@@ -117,6 +117,16 @@
 #   (Optional) Object API version to use.
 #   Defaults to undef.
 #
+# DEPRECATED PARAMETERS
+#
+# [*project_domain*]
+#   (Optional) Project domain in v3 api.
+#   Defaults to 'Default'.
+#
+# [*user_domain*]
+#   (Optional) User domain in v3 api.
+#   Defaults to 'Default'.
+#
 class openstack_extras::auth_file (
   $password,
   $auth_url               = 'http://127.0.0.1:5000/v3/',
@@ -127,8 +137,8 @@ class openstack_extras::auth_file (
   $project_name           = 'openstack',
   $region_name            = 'RegionOne',
   $use_no_cache           = true,
-  $project_domain         = 'default',
-  $user_domain            = 'default',
+  $project_domain_name    = 'Default',
+  $user_domain_name       = 'Default',
   $auth_type              = undef,
   $os_interface           = 'public',
   $os_endpoint_type       = 'publicURL',
@@ -145,8 +155,27 @@ class openstack_extras::auth_file (
   $volume_api_version     = undef,
   $identity_api_version   = '3',
   $object_api_version     = undef,
+  # DEPRECATED PARAMETERS
+  $project_domain         = undef,
+  $user_domain            = undef,
 ) {
 
+  if $project_domain != undef {
+    warning('project_domain is deprecated and will be removed in a future release. \
+Use project_domain_name instead')
+    $project_domain_name_real = $project_domain
+  } else {
+    $project_domain_name_real = $project_domain_name
+  }
+
+  if $user_domain != undef {
+    warning('user_domain is deprecated and will be removed in a future release. \
+Use user_domain_name instead')
+    $user_domain_name_real = $user_domain
+  } else {
+    $user_domain_name_real = $user_domain_name
+  }
+
   file { $path:
     owner     => 'root',
     group     => 'root',
diff --git a/releasenotes/notes/rename-to-domain_name-d7bc8a7b44c619c8.yaml b/releasenotes/notes/rename-to-domain_name-d7bc8a7b44c619c8.yaml
new file mode 100644
index 0000000..5ac69f2
--- /dev/null
+++ b/releasenotes/notes/rename-to-domain_name-d7bc8a7b44c619c8.yaml
@@ -0,0 +1,9 @@
+---
+deprecations:
+  - |
+    The following parameters in ``openstack_extras::auth_file`` class has been
+    deprecated and will be removed in a future release. Use new parameters
+    instead.
+
+    - ``user_domain`` (now renamed to ``user_domain_name``)
+    - ``project_domain`` (now renamed to ``project_domain_name``)
diff --git a/spec/classes/openstack_extras_auth_file_spec.rb b/spec/classes/openstack_extras_auth_file_spec.rb
index f2e4b31..3075a3b 100644
--- a/spec/classes/openstack_extras_auth_file_spec.rb
+++ b/spec/classes/openstack_extras_auth_file_spec.rb
@@ -26,8 +26,8 @@ describe 'openstack_extras::auth_file' do
           'export OS_AUTH_URL=\'http://127.0.0.1:5000/v3/\'',
           'export OS_AUTH_STRATEGY=\'keystone\'',
           'export OS_REGION_NAME=\'RegionOne\'',
-          'export OS_PROJECT_DOMAIN_NAME=\'default\'',
-          'export OS_USER_DOMAIN_NAME=\'default\'',
+          'export OS_PROJECT_DOMAIN_NAME=\'Default\'',
+          'export OS_USER_DOMAIN_NAME=\'Default\'',
           'export OS_INTERFACE=\'public\'',
           'export OS_ENDPOINT_TYPE=\'publicURL\'',
           'export CINDER_ENDPOINT_TYPE=\'publicURL\'',
@@ -61,8 +61,8 @@ describe 'openstack_extras::auth_file' do
           :neutron_endpoint_type    => 'internalURL',
           :auth_strategy            => 'no_auth',
           :path                     => '/path/to/file',
-          :user_domain              => 'anotherdomain',
-          :project_domain           => 'anotherdomain',
+          :user_domain_name         => 'anotherdomain',
+          :project_domain_name      => 'anotherdomain',
           :compute_api_version      => '2.1',
           :network_api_version      => '2.0',
           :image_api_version        => '2',
diff --git a/templates/openrc.erb b/templates/openrc.erb
index 83d9dcd..5288079 100644
--- a/templates/openrc.erb
+++ b/templates/openrc.erb
@@ -15,11 +15,11 @@ export OS_PASSWORD='<%= @password.gsub(/'/){ %q(\') } %>'
 export OS_AUTH_URL='<%= @auth_url %>'
 export OS_AUTH_STRATEGY='<%= @auth_strategy %>'
 export OS_REGION_NAME='<%= @region_name %>'
-<% if @project_domain -%>
-export OS_PROJECT_DOMAIN_NAME='<%= @project_domain %>'
+<% if @project_domain_name_real -%>
+export OS_PROJECT_DOMAIN_NAME='<%= @project_domain_name_real %>'
 <% end -%>
-<% if @user_domain -%>
-export OS_USER_DOMAIN_NAME='<%= @user_domain %>'
+<% if @user_domain_name_real -%>
+export OS_USER_DOMAIN_NAME='<%= @user_domain_name_real %>'
 <% end -%>
 <% if @auth_type -%>
 export OS_AUTH_TYPE='<%= @auth_type %>'