diff --git a/src/lerobot/datasets/dataset_tools.py b/src/lerobot/datasets/dataset_tools.py
index cc9fea20c..9b397f299 100644
--- a/src/lerobot/datasets/dataset_tools.py
+++ b/src/lerobot/datasets/dataset_tools.py
@@ -1444,7 +1444,7 @@ def modify_tasks(
     2. Set specific tasks for specific episodes (using `episode_tasks`)
     3. Replace existing task strings wherever they appear (using `task_replacements`)
 
-    You can combine all of them: `new_task` sets the default, while `episode_tasks` and 
+    You can combine all of them: `new_task` sets the default, while `episode_tasks` and
     `task_replacements` override specific episodes, with `episode_tasks` taking precedence.
 
     The dataset is modified in-place, updating only the task-related files:
diff --git a/tests/datasets/test_dataset_tools.py b/tests/datasets/test_dataset_tools.py
index 72928b1f0..95c94f22c 100644
--- a/tests/datasets/test_dataset_tools.py
+++ b/tests/datasets/test_dataset_tools.py
@@ -1177,7 +1177,9 @@ def test_modify_tasks_default_task_and_replacements(sample_dataset):
 
 def test_modify_tasks_no_task_specified(sample_dataset):
     """Test error when no task is specified."""
-    with pytest.raises(ValueError, match="Must specify at least one of new_task, episode_tasks, or task_replacements"):
+    with pytest.raises(
+        ValueError, match="Must specify at least one of new_task, episode_tasks, or task_replacements"
+    ):
         modify_tasks(sample_dataset)