diff --git a/opencl_fdtd/simulation.py b/opencl_fdtd/simulation.py
index 1e573c9..988e45b 100644
--- a/opencl_fdtd/simulation.py
+++ b/opencl_fdtd/simulation.py
@@ -321,7 +321,6 @@ class Simulation(object):
                                    arguments=', '.join(args.keys()))
         return lambda e: update(*args.values(), wait_for=e)
 
-
     def _create_context(self, context: pyopencl.Context = None,
                         queue: pyopencl.CommandQueue = None):
         if context is None:
@@ -353,6 +352,7 @@ class Simulation(object):
                 Exception('Initial field list elements must have same shape as epsilon elements')
             return pyopencl.array.to_device(self.queue, vec(initial_value).astype(self.arg_type))
 
+
 def type_to_C(float_type) -> str:
     """
     Returns a string corresponding to the C equivalent of a numpy type.