diff --git a/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex b/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
index 6be0f2baf..6b7c67012 100644
--- a/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
+++ b/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
@@ -161,6 +161,9 @@ def masto_instance(conn, _params) do
       },
       stats: Stats.get_stats(),
       thumbnail: Web.base_url() <> "/instance/thumbnail.jpeg",
+      languages: ["en"],
+      registrations: Pleroma.Config.get([:instance, :registrations_open]),
+      # Extra (not present in Mastodon):
       max_toot_chars: Keyword.get(instance, :limit)
     }
 
diff --git a/test/web/mastodon_api/mastodon_api_controller_test.exs b/test/web/mastodon_api/mastodon_api_controller_test.exs
index b2302422b..21e88eda9 100644
--- a/test/web/mastodon_api/mastodon_api_controller_test.exs
+++ b/test/web/mastodon_api/mastodon_api_controller_test.exs
@@ -1808,6 +1808,27 @@ test "requires 'write' permission", %{conn: conn} do
   end
 
   test "get instance information", %{conn: conn} do
+    conn = get(conn, "/api/v1/instance")
+    assert result = json_response(conn, 200)
+
+    # Note: not checking for "max_toot_chars" since it's optional
+    assert %{
+             "uri" => _,
+             "title" => _,
+             "description" => _,
+             "version" => _,
+             "email" => _,
+             "urls" => %{
+               "streaming_api" => _
+             },
+             "stats" => _,
+             "thumbnail" => _,
+             "languages" => _,
+             "registrations" => _
+           } = result
+  end
+
+  test "get instance stats", %{conn: conn} do
     user = insert(:user, %{local: true})
 
     user2 = insert(:user, %{local: true})