diff --git a/src/borg/archiver/completion_cmd.py b/src/borg/archiver/completion_cmd.py
index e90f7a4ad..abcc04f79 100644
--- a/src/borg/archiver/completion_cmd.py
+++ b/src/borg/archiver/completion_cmd.py
@@ -56,7 +56,16 @@ import shtab
 
 from ._common import process_epilog
 from ..constants import *  # NOQA
-from ..helpers import archivename_validator, SortBySpec, FilesCacheMode, PathSpec, ChunkerParams, tag_validator, relative_time_marker_validator, parse_file_size
+from ..helpers import (
+    archivename_validator,
+    SortBySpec,
+    FilesCacheMode,
+    PathSpec,
+    ChunkerParams,
+    tag_validator,
+    relative_time_marker_validator,
+    parse_file_size,
+)
 from ..helpers.time import timestamp
 from ..compress import CompressionSpec
 from ..helpers.parseformat import partial_format
@@ -368,9 +377,11 @@ _borg_complete_archive() {
     # Use tab as delimiter to avoid issues with spaces in archive names
     local out
     if (( ${#repo_arg[@]} > 0 )); then
-      out=$( borg repo-list "${repo_arg[@]}" --format '{id}{TAB}{archive}{TAB}{time}{TAB}{username}@{hostname}{NL}' 2>/dev/null </dev/null )
+      out=$( borg repo-list "${repo_arg[@]}" --format '{id}{TAB}{archive}{TAB}{time}{TAB}{username}@{hostname}{NL}' \
+             2>/dev/null </dev/null )
     else
-      out=$( borg repo-list --format '{id}{TAB}{archive}{TAB}{time}{TAB}{username}@{hostname}{NL}' 2>/dev/null </dev/null )
+      out=$( borg repo-list --format '{id}{TAB}{archive}{TAB}{time}{TAB}{username}@{hostname}{NL}' \
+             2>/dev/null </dev/null )
     fi
     [[ -z "$out" ]] && return 0
 
@@ -665,21 +676,15 @@ class CompletionMixIn:
         )
         _attach_completion(parser, PathSpec, shtab.DIRECTORY)
         _attach_completion(
-            parser,
-            ChunkerParams,
-            {"bash": "_borg_complete_chunker_params", "zsh": "_borg_complete_chunker_params"},
-        )
-        _attach_completion(
-            parser, tag_validator, {"bash": "_borg_complete_tags", "zsh": "_borg_complete_tags"}
+            parser, ChunkerParams, {"bash": "_borg_complete_chunker_params", "zsh": "_borg_complete_chunker_params"}
         )
+        _attach_completion(parser, tag_validator, {"bash": "_borg_complete_tags", "zsh": "_borg_complete_tags"})
         _attach_completion(
             parser,
             relative_time_marker_validator,
             {"bash": "_borg_complete_relative_time", "zsh": "_borg_complete_relative_time"},
         )
-        _attach_completion(
-            parser, timestamp, {"bash": "_borg_complete_timestamp", "zsh": "_borg_complete_timestamp"}
-        )
+        _attach_completion(parser, timestamp, {"bash": "_borg_complete_timestamp", "zsh": "_borg_complete_timestamp"})
         _attach_completion(
             parser, parse_file_size, {"bash": "_borg_complete_file_size", "zsh": "_borg_complete_file_size"}
         )
@@ -701,46 +706,19 @@ class CompletionMixIn:
         help_choices = " ".join(sorted(help_choices))
 
         # Compression spec choices (static list)
-        comp_spec_choices = [
-            "lz4",
-            "zstd,3",
-            "auto,zstd,10",
-            "zlib,6",
-            "lzma,6",
-            "obfuscate,250,lz4",
-            "none",
-        ]
+        comp_spec_choices = ["lz4", "zstd,3", "auto,zstd,10", "zlib,6", "lzma,6", "obfuscate,250,lz4", "none"]
         comp_spec_choices_str = " ".join(comp_spec_choices)
 
         # Chunker params choices (static list)
-        chunker_params_choices = [
-            "default",
-            "fixed,4194304",
-            "buzhash,19,23,21,4095",
-            "buzhash64,19,23,21,4095",
-        ]
+        chunker_params_choices = ["default", "fixed,4194304", "buzhash,19,23,21,4095", "buzhash64,19,23,21,4095"]
         chunker_params_choices_str = " ".join(chunker_params_choices)
 
         # Relative time marker choices (static list)
-        relative_time_choices = [
-            "60S",
-            "60M",
-            "24H",
-            "7d",
-            "4w",
-            "12m",
-            "1000y",
-        ]
+        relative_time_choices = ["60S", "60M", "24H", "7d", "4w", "12m", "1000y"]
         relative_time_choices_str = " ".join(relative_time_choices)
 
         # File size choices (static list)
-        file_size_choices = [
-            "500M",
-            "1G",
-            "10G",
-            "100G",
-            "1T",
-        ]
+        file_size_choices = ["500M", "1G", "10G", "100G", "1T"]
         file_size_choices_str = " ".join(file_size_choices)
 
         mapping = {