diff --git a/.github/workflows/autoformat.yaml b/.github/workflows/autoformat.yaml
index 951f602..7cc1edf 100644
--- a/.github/workflows/autoformat.yaml
+++ b/.github/workflows/autoformat.yaml
@@ -15,6 +15,13 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+      - name: Generate token
+        id: generate_token
+        uses: tibdex/github-app-token@b62528385c34dbc9f38e5f4225ac829252d1ea92
+        with:
+          app_id: ${{ secrets.BOT_APP_ID }}
+          private_key: ${{ secrets.BOT_APP_PRIVATE_KEY }}
+
       - uses: xt0rted/pull-request-comment-branch@v2
         id: comment-branch
 
@@ -22,6 +29,7 @@ jobs:
         if: success()
         with:
           ref: ${{ steps.comment-branch.outputs.head_ref }}
+          persist-credentials: false # otherwise, the token used is the GITHUB_TOKEN, instead of your personal access token.
 
       - name: Lint with black
         uses: psf/black@stable
@@ -30,13 +38,6 @@ jobs:
           src: "."
           jupyter: true
 
-      - name: Generate token
-        id: generate_token
-        uses: tibdex/github-app-token@b62528385c34dbc9f38e5f4225ac829252d1ea92
-        with:
-          app_id: ${{ secrets.BOT_APP_ID }}
-          private_key: ${{ secrets.BOT_APP_PRIVATE_KEY }}
-
       - name: Commit changes
         uses: stefanzweifel/git-auto-commit-action@v5
         with:
diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index a8798e3..ca71277 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -9,7 +9,7 @@ on:
       - main
 
 jobs:
-  lint:
+  black:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
diff --git a/ereg/functional.py b/ereg/functional.py
index a115ebe..5469e27 100644
--- a/ereg/functional.py
+++ b/ereg/functional.py
@@ -29,7 +29,7 @@ def registration_function(
         float: The structural similarity index.
     """
     if isinstance(config_file, str):
-        assert os.path.isfile(config_file), 'Config file does not exist.'
+        assert os.path.isfile(config_file), "Config file does not exist."
     elif isinstance(config_file, dict):
         pass
     else: