diff --git a/app/serializers/v1/public/client_side_render_serializer.rb b/app/serializers/v1/public/client_side_render_serializer.rb
index 73a35de..8c40b1f 100644
--- a/app/serializers/v1/public/client_side_render_serializer.rb
+++ b/app/serializers/v1/public/client_side_render_serializer.rb
@@ -1,6 +1,7 @@
 module V1
   module Public
     class ClientSideRenderSerializer < ApplicationSerializer
+      # Return nothing apart from the ID and type.
     end
   end
 end
diff --git a/app/serializers/v1/public/page_view_serializer.rb b/app/serializers/v1/public/page_view_serializer.rb
index ad318ad..85f60fc 100644
--- a/app/serializers/v1/public/page_view_serializer.rb
+++ b/app/serializers/v1/public/page_view_serializer.rb
@@ -1,6 +1,7 @@
 module V1
   module Public
     class PageViewSerializer < ApplicationSerializer
+      # Return nothing apart from the ID and type.
     end
   end
 end
diff --git a/app/serializers/v1/public/server_side_render_serializer.rb b/app/serializers/v1/public/server_side_render_serializer.rb
index 0d4cf52..3bfdf36 100644
--- a/app/serializers/v1/public/server_side_render_serializer.rb
+++ b/app/serializers/v1/public/server_side_render_serializer.rb
@@ -1,6 +1,7 @@
 module V1
   module Public
     class ServerSideRenderSerializer < ApplicationSerializer
+      # Return nothing apart from the ID and type.
     end
   end
 end