diff --git a/radicalpy/kinetics.py b/radicalpy/kinetics.py
index ea02f8f..4f8d03d 100644
--- a/radicalpy/kinetics.py
+++ b/radicalpy/kinetics.py
@@ -2,8 +2,12 @@
 
 import numpy as np
 
-from .simulation import (HilbertIncoherentProcessBase, LiouvilleIncoherentProcessBase,
-                         LiouvilleSimulation, State)
+from .simulation import (
+    HilbertIncoherentProcessBase,
+    LiouvilleIncoherentProcessBase,
+    LiouvilleSimulation,
+    State,
+)
 
 
 class HilbertKineticsBase(HilbertIncoherentProcessBase):
diff --git a/radicalpy/utils.py b/radicalpy/utils.py
index ce244b1..e1f0260 100644
--- a/radicalpy/utils.py
+++ b/radicalpy/utils.py
@@ -295,7 +295,9 @@ def mT_to_angular_frequency(mT: float) -> float:
     return mT * (C.mu_B / C.hbar * -C.g_e / 1e9)
 
 
-def reference_signal(timeconstant: np.ndarray, harmonic: float, theta: float, frequency: float):
+def reference_signal(
+    timeconstant: np.ndarray, harmonic: float, theta: float, frequency: float
+):
     """Modulated MARY reference signal.
 
     Used for brute force modulated MARY simulations.