diff --git a/data_utils/augmentor/augmentation.py b/data_utils/augmentor/augmentation.py
index f8fd214a..9dced473 100644
--- a/data_utils/augmentor/augmentation.py
+++ b/data_utils/augmentor/augmentation.py
@@ -9,7 +9,8 @@ from data_utils.augmentor.volume_perturb import VolumePerturbAugmentor
 from data_utils.augmentor.shift_perturb import ShiftPerturbAugmentor
 from data_utils.augmentor.speed_perturb import SpeedPerturbAugmentor
 from data_utils.augmentor.resample import ResampleAugmentor
-from data_utils.augmentor.online_bayesian_normalization import OnlineBayesianNormalizationAugmentor
+from data_utils.augmentor.online_bayesian_normalization import \
+     OnlineBayesianNormalizationAugmentor
 
 
 class AugmentationPipeline(object):
diff --git a/data_utils/augmentor/speed_perturb.py b/data_utils/augmentor/speed_perturb.py
index 8c6c8b63..cc5738bd 100644
--- a/data_utils/augmentor/speed_perturb.py
+++ b/data_utils/augmentor/speed_perturb.py
@@ -15,10 +15,10 @@ class SpeedPerturbAugmentor(AugmentorBase):
     :param rng: Random generator object.
     :type rng: random.Random
     :param min_speed_rate: Lower bound of new speed rate to sample and should
-                           not below 0.9.
+                           not be smaller than 0.9.
     :type min_speed_rate: float
     :param max_speed_rate: Upper bound of new speed rate to sample and should
-                           not above 1.1.
+                           not be larger than 1.1.
     :type max_speed_rate: float
     """