diff --git a/pyrato/parametric.py b/pyrato/parametric.py
index b2257f4e..0253a949 100644
--- a/pyrato/parametric.py
+++ b/pyrato/parametric.py
@@ -187,7 +187,7 @@ def air_attenuation_coefficient(
 
     return air_abs_coeff
 
-  
+
 def critical_distance(
                      volume,
                      reverberation_time):
@@ -252,8 +252,9 @@ def mean_free_path(
 
 def reverberation_time_eyring(volume,surface,mean_alpha):
     r"""
-    function which calculates reverberation time in rooms as
-    defined by Carl F. Eyring.
+    Calculate reverberation time using Eyring's equation.
+
+    The Eyring reverberation time is defined as [#]_
 
     .. math::
         T_{60} = -0.161 \frac{\text{volume}}{\text{surface} \cdot
@@ -276,8 +277,7 @@ def reverberation_time_eyring(volume,surface,mean_alpha):
     References
     ----------
     .. [#] Eyring, C.F., 1930. Reverberation time in “dead” rooms. The Journal
-    of the Acoustical Society of America, 1(2A_Supplement), pp.168-168.
-
+           of the Acoustical Society of America, 1(2A_Supplement), pp.168-168.
     """
 
     if volume <= 0:
diff --git a/tests/test_parametric_eyring.py b/tests/test_parametric_eyring.py
index 757a3c2e..1161ef2c 100644
--- a/tests/test_parametric_eyring.py
+++ b/tests/test_parametric_eyring.py
@@ -1,4 +1,4 @@
-"""Tests for Eyring's equation"""
+"""Tests for Eyring's equation."""
 import numpy.testing as npt
 import pytest
 from pyrato.parametric import reverberation_time_eyring
@@ -10,7 +10,7 @@ def test_analytic_Eyring():
     reverb_test = reverberation_time_eyring(volume,surface,mean_alpha)
     npt.assert_allclose(reverb_test, 0.481, rtol=1e-3)
 
-@pytest.mark.parametrize("volume, surface", [(0, -2), (-1, 0)])
+@pytest.mark.parametrize(("volume", "surface"), [(0, -2), (-1, 0)])
 def test_input_geometry_Eyring(volume, surface):
     mean_alpha = 0.2
     with pytest.raises(ValueError, match="should be larger than 0"):
@@ -21,6 +21,6 @@ def test_input_alpha_Eyring(mean_alpha):
     volume = 64
     surface = 96
     with pytest.raises(
-        ValueError, match="mean_alpha should be between 0 and 1"
+        ValueError, match="mean_alpha should be between 0 and 1",
     ):
         reverberation_time_eyring(volume,surface,mean_alpha)