diff --git a/Makefile b/Makefile
index 3fd7fcd..afd9c6c 100644
--- a/Makefile
+++ b/Makefile
@@ -49,6 +49,7 @@ clean-test: ## remove test and coverage artifacts
 
 lint: ## check style with flake8
 	flake8 src tests
+	pylint src tests/*
 
 test: install ## run tests quickly with the default Python
 	py.test tests
diff --git a/docs/asymmetric.rst b/docs/asymmetric.rst
index a57dcc6..bc1d21c 100644
--- a/docs/asymmetric.rst
+++ b/docs/asymmetric.rst
@@ -20,8 +20,7 @@ RSA
     :members:
     :inherited-members:
 
-Example
-~~~~~~~
+**Example:**
 
     >>> from wolfcrypt.ciphers import RsaPrivate, RsaPublic
     >>> from wolfcrypt.utils import h2b
diff --git a/docs/symmetric.rst b/docs/symmetric.rst
index 9c792a9..e4a9fc1 100644
--- a/docs/symmetric.rst
+++ b/docs/symmetric.rst
@@ -7,17 +7,25 @@ Symmetric Key Algorithms
 cryptographic key** for both encryption and decryption of data.
 This operation is also known as **Symmetric Key Encryption**.
 
-``wolfcrypt`` provides access to the following **Symmetric Key Ciphers**:
+Symmetric Key Encryption Classes
+--------------------------------
+
+Interface
+~~~~~~~~~
+
+All **Symmetric Key Ciphers** available in this module implements the following
+interface:
+
+.. autoclass:: _Cipher
+    :members:
 
 AES
----
+~~~
 
 .. autoclass:: Aes
     :members:
-    :inherited-members:
 
-Example
-~~~~~~~
+**Example:**
 
 .. doctest::
 
@@ -31,14 +39,12 @@ Example
     b'now is the time '
 
 Triple DES
-----------
+~~~~~~~~~~
 
 .. autoclass:: Des3
     :members:
-    :inherited-members:
 
-Example
-~~~~~~~
+**Example:**
 
 .. doctest::
 
diff --git a/src/wolfcrypt/ciphers.py b/src/wolfcrypt/ciphers.py
index 5e5fc9b..e47de1e 100644
--- a/src/wolfcrypt/ciphers.py
+++ b/src/wolfcrypt/ciphers.py
@@ -67,7 +67,7 @@ class _Cipher(object):
                 raise ValueError("key must be %s in length, not %d" %
                                  (self._key_sizes, len(key)))
         elif not key:  # pragma: no cover
-                raise ValueError("key must not be 0 in length")
+            raise ValueError("key must not be 0 in length")
 
         if IV is not None and len(IV) != self.block_size:
             raise ValueError("IV must be %d in length, not %d" %
@@ -101,10 +101,10 @@ class _Cipher(object):
         """
         Encrypts a non-empty string, using the key-dependent data in
         the object, and with the appropriate feedback mode.
-        
+
         The string's length must be an exact multiple of the algorithm's
         block size or, in CFB mode, of the segment size.
-        
+
         Returns a string containing the ciphertext.
         """
         string = t2b(string)
@@ -130,10 +130,10 @@ class _Cipher(object):
         """
         Decrypts **string**, using the key-dependent data in the
         object and with the appropriate feedback mode.
-        
+
         The string's length must be an exact multiple of the algorithm's
         block size or, in CFB mode, of the segment size.
-        
+
         Returns a string containing the plaintext.
         """
         string = t2b(string)
@@ -436,7 +436,7 @@ class EccPublic(_Ecc):
 
         ret = _lib.wc_ecc_export_x963(self.native_object, x963, x963_size)
         if ret != 0:  # pragma: no cover
-            raise WolfCryptError("x963 export error (%d)" % ret) 
+            raise WolfCryptError("x963 export error (%d)" % ret)
 
         return _ffi.buffer(x963, x963_size[0])[:]
 
diff --git a/tests/test_ciphers.py b/tests/test_ciphers.py
index d7190bc..48c7572 100644
--- a/tests/test_ciphers.py
+++ b/tests/test_ciphers.py
@@ -308,7 +308,7 @@ def test_ecc_make_shared_secret():
     b_pub = EccPublic()
     b_pub.import_x963(b.export_x963())
 
-    assert a.shared_secret(b) == \
-           b.shared_secret(a) == \
-           a.shared_secret(b_pub) == \
-           b.shared_secret(a_pub)
+    assert a.shared_secret(b) \
+        == b.shared_secret(a) \
+        == a.shared_secret(b_pub) \
+        == b.shared_secret(a_pub)