diff --git a/sparkles/core.py b/sparkles/core.py
index abfcf89..5929858 100644
--- a/sparkles/core.py
+++ b/sparkles/core.py
@@ -3,6 +3,7 @@
 """
 Preliminary review of ACA catalogs selected by proseco.
 """
+
 import gzip
 import io
 import pickle
diff --git a/sparkles/find_er_catalog.py b/sparkles/find_er_catalog.py
index 6e0d0c5..bb496ee 100644
--- a/sparkles/find_er_catalog.py
+++ b/sparkles/find_er_catalog.py
@@ -63,6 +63,7 @@
      from the star fields that appear to be the best based on available stars.
    3. Prioritize by the order of attitudes passed in to the function.
 """
+
 import agasc
 import numpy as np
 import proseco.characteristics_guide as GUIDE
diff --git a/sparkles/roll_optimize.py b/sparkles/roll_optimize.py
index edc3902..fa149ff 100644
--- a/sparkles/roll_optimize.py
+++ b/sparkles/roll_optimize.py
@@ -3,6 +3,7 @@
 """
 Roll optimization during preliminary review of ACA catalogs.
 """
+
 import warnings
 from copy import deepcopy