diff --git a/app/models/site_customization/content_block.rb b/app/models/site_customization/content_block.rb
index c08beb52e..81cd842fa 100644
--- a/app/models/site_customization/content_block.rb
+++ b/app/models/site_customization/content_block.rb
@@ -1,5 +1,5 @@
 class SiteCustomization::ContentBlock < ActiveRecord::Base
-  VALID_BLOCKS = %w(top_links footer)
+  VALID_BLOCKS = %w(top_links footer subnavigation_before subnavigation_after)
 
   validates :locale, presence: true, inclusion: { in: I18n.available_locales.map(&:to_s) }
   validates :name, presence: true, uniqueness: { scope: :locale }, inclusion: { in: VALID_BLOCKS }