diff --git a/lib/pleroma/web/activity_pub/object_validators/create_generic_validator.ex b/lib/pleroma/web/activity_pub/object_validators/create_generic_validator.ex
index 4ad4ca0de..f467ccc7c 100644
--- a/lib/pleroma/web/activity_pub/object_validators/create_generic_validator.ex
+++ b/lib/pleroma/web/activity_pub/object_validators/create_generic_validator.ex
@@ -23,6 +23,7 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.CreateGenericValidator do
     field(:to, Types.Recipients, default: [])
     field(:cc, Types.Recipients, default: [])
     field(:object, Types.ObjectID)
+    field(:expires_at, Types.DateTime)
   end
 
   def cast_data(data) do
diff --git a/lib/pleroma/web/activity_pub/side_effects.ex b/lib/pleroma/web/activity_pub/side_effects.ex
index c17197bec..5104d38ee 100644
--- a/lib/pleroma/web/activity_pub/side_effects.ex
+++ b/lib/pleroma/web/activity_pub/side_effects.ex
@@ -139,6 +139,8 @@ defmodule Pleroma.Web.ActivityPub.SideEffects do
   # - Rollback if we couldn't create it
   # - Increase the user note count
   # - Increase the reply count
+  # - Increase replies count
+  # - Set up ActivityExpiration
   # - Set up notifications
   def handle(%{data: %{"type" => "Create"}} = activity, meta) do
     with {:ok, object, meta} <- handle_object_creation(meta[:object_data], meta),