diff --git a/zfs-backup.py b/zfs-backup.py
index dc1a686..e416fdc 100755
--- a/zfs-backup.py
+++ b/zfs-backup.py
@@ -52,6 +52,7 @@ def main():
 # TODO print time estimation while scrub is in progress
 # skip send when sender and receiver snapshots are equal
 
+
 class Manager:
     def __init__(self, local_pool: Pool, external_pool: ExternalPool):
         self._local_pool = local_pool
@@ -111,7 +112,9 @@ class Manager:
                 return dataset
 
     @classmethod
-    def _get_last_common_snapshot(cls, local_dataset: Dataset, remote_dataset: Dataset) -> Snapshot:
+    def _get_last_common_snapshot(
+        cls, local_dataset: Dataset, remote_dataset: Dataset
+    ) -> Snapshot:
         common_snapshots = [
             local_snap
             for local_snap in list(cls._find_snapshots_with_backup_tag(local_dataset))
@@ -280,6 +283,7 @@ class ZFS:
         if wait_for_finish:
             # TODO make Ctrl-c interrupt this
             run_command([config.ZPOOL, "wait", "-t", "scrub", pool])
+
     # TODO raise error if pool is not healthy
 
 
@@ -444,7 +448,9 @@ class Dataset:
         for snapshot in old_snapshots:
             snapshot.destroy()
 
-    def _get_n_oldest_snapshots(self, snapshots: list[Snapshot], count: int) -> list[Snapshot]:
+    def _get_n_oldest_snapshots(
+        self, snapshots: list[Snapshot], count: int
+    ) -> list[Snapshot]:
         snapshots.sort()
         return snapshots[:count]