diff --git a/docs/tutorials/04_from_legacy.ipynb b/docs/tutorials/04_from_legacy.ipynb
index f91e6f6e..79e7e5c8 100644
--- a/docs/tutorials/04_from_legacy.ipynb
+++ b/docs/tutorials/04_from_legacy.ipynb
@@ -37,6 +37,8 @@
     }
    ],
    "source": [
+    "from __future__ import annotations\n",
+    "\n",
     "import pandas as pd\n",
     "from timeseriesflattener.aggregation_fns import (\n",
     "    boolean,\n",
@@ -58,8 +60,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from timeseriesflattener.feature_specs.group_specs import NamedDataframe\n",
-    "from timeseriesflattener.feature_specs.group_specs import PredictorGroupSpec\n",
+    "from timeseriesflattener.feature_specs.group_specs import NamedDataframe, PredictorGroupSpec\n",
     "from timeseriesflattener.feature_specs.single_specs import PredictorSpec as Version1PredictorSpec\n",
     "\n",
     "legacy_spec = PredictorGroupSpec(\n",