diff --git a/.readthedocs.yml b/.readthedocs.yml
index 07ff00d..849e7b8 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -19,5 +19,4 @@ python:
   install:
     - requirements: docs/requirements.txt
     - method: setuptools
-      path: .    
-          
\ No newline at end of file
+      path: .
diff --git a/README.md b/README.md
index 5d5cd53..a9ccfb2 100644
--- a/README.md
+++ b/README.md
@@ -8,15 +8,16 @@
 
 This project implements the Synchronized Swept Sine Method as a reusable python package.
 It is structured according to the papers by [Novak et al. 2015](https://doi.org/10.17743/jaes.2015.0071) and [Novak et al. 2010](https://doi.org/10.1109/TIM.2009.2031836), but equations and symbol names are adapted to code conventions, also known as PEP 8.
-Anyway, references to symbols and equations are given in the code comments. 
+However, references to symbols and equations are given in the code comments. 
 Most important classes are
 
 -  `SyncSweep` for the generation of the synchronized swept sine singal
 -  `HigherHarmonicImpulseResponse` for the deconvolution from sweep input and output signal.
--  `HammersteinModel` filtering of signals with the hammerstein model.
--  `LinearModel` filtering of signals with the linear kernel e.g.  from a `HigherHarmonicImpulseResponse`
+-  `HammersteinModel` estimation and filtering of signals with the hammerstein model.
+-  `LinearModel` estimation and filtering of signals with the linear kernel e.g.  from a `HigherHarmonicImpulseResponse`
 
 Examples are placed in the examples folder.
+A small example, estimating the coefficients of a nonlinear system, is listed below:
 
 ```python
 import numpy as np
diff --git a/examples/example1.py b/examples/example1.py
index 004c2d7..f1337e0 100644
--- a/examples/example1.py
+++ b/examples/example1.py
@@ -95,8 +95,8 @@
     ylabel('$\\phi$ / rad')
     grid()
     lines = l0 + l1 + l2 + l3
-    labels = [l.get_label() for l in lines]
+    labels = [line.get_label() for line in lines]
     legend(lines, labels)
     xlabel('Frequency $f$ / Hz')
 
-show()
\ No newline at end of file
+show()
diff --git a/syncsweptsine.py b/syncsweptsine.py
index 5ec2aa8..2d9be9e 100644
--- a/syncsweptsine.py
+++ b/syncsweptsine.py
@@ -870,7 +870,7 @@ def from_sweeps(cls, syncsweep, measuredsweep, fftlen=None, regularize=1e-6):
             reguspec = invert_spectrum_reg(rinvspec*sweepspec, beta=regularize)
             rinvspec[1:] = rinvspec[1:]*reguspec[1:]
         else:
-            rspec /=  syncsweep.samplerate
+            rspec /= syncsweep.samplerate
         return cls.from_spectra(
             rspec=rspec,
             rinvspec=rinvspec,
@@ -918,7 +918,7 @@ class FrfFilterKernel(object):
 
     """
     def __init__(self, freq, frf, ir=None):
-        if len(freq) !=  len(frf):
+        if len(freq) != len(frf):
             raise ValueError('`freq` and `frf` must have the same length, not ', len(freq), len(frf))
         self._frf = frf
         self._freq = freq