diff --git a/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex b/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex
index 398020bff..766421e60 100644
--- a/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex
+++ b/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex
@@ -15,6 +15,7 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.AttachmentValidator do
     field(:type, :string)
     field(:mediaType, ObjectValidators.MIME, default: "application/octet-stream")
     field(:name, :string)
+    field(:summary, :string)
     field(:blurhash, :string)
 
     embeds_many :url, UrlObjectValidator, primary_key: false do
@@ -44,7 +45,7 @@ def changeset(struct, data) do
       |> fix_url()
 
     struct
-    |> cast(data, [:id, :type, :mediaType, :name, :blurhash])
+    |> cast(data, [:id, :type, :mediaType, :name, :summary, :blurhash])
     |> cast_embed(:url, with: &url_changeset/2, required: true)
     |> validate_inclusion(:type, ~w[Link Document Audio Image Video])
     |> validate_required([:type, :mediaType])
diff --git a/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs b/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs
index 77f2044e9..8d561603c 100644
--- a/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs
+++ b/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs
@@ -25,19 +25,22 @@ test "fails without url" do
     end
 
     test "works with honkerific attachments" do
-      attachment = %{
+      honk = %{
         "mediaType" => "",
-        "name" => "",
-        "summary" => "298p3RG7j27tfsZ9RQ.jpg",
+        "summary" => "Select your spirit chonk",
+        "name" => "298p3RG7j27tfsZ9RQ.jpg",
         "type" => "Document",
         "url" => "https://honk.tedunangst.com/d/298p3RG7j27tfsZ9RQ.jpg"
       }
 
       assert {:ok, attachment} =
-               AttachmentValidator.cast_and_validate(attachment)
+               honk
+               |> AttachmentValidator.cast_and_validate()
                |> Ecto.Changeset.apply_action(:insert)
 
       assert attachment.mediaType == "application/octet-stream"
+      assert attachment.summary == "Select your spirit chonk"
+      assert attachment.name == "298p3RG7j27tfsZ9RQ.jpg"
     end
 
     test "works with an unknown but valid mime type" do