add SEED docs, tests, small fixes
diff --git a/docs/hazmat/primitives/symmetric-encryption.rst b/docs/hazmat/primitives/symmetric-encryption.rst
index 28de611..1a4df22 100644
--- a/docs/hazmat/primitives/symmetric-encryption.rst
+++ b/docs/hazmat/primitives/symmetric-encryption.rst
@@ -130,6 +130,17 @@
:param bytes key: The secret key, This must be kept secret. 40 to 128 bits
in length in increments of 8 bits.
+.. class:: SEED(key)
+
+ .. versionadded:: 0.4
+
+ SEED is a block cipher developed by the Korea Information Security Agency (
+ KISA). It is defined in :rfc:`4269` and is used broadly throughout South
+ Korean industry, but rarely found elsewhere.
+
+ :param bytes key: The secret key. This must be kept secret. ``128`` bits in
+ length.
+
Weak ciphers
------------
@@ -176,7 +187,7 @@
is susceptible to attacks when using weak keys. It is recommended that you
do not use this cipher for new applications.
- :param bytes key: The secret key This must be kept secret. ``128`` bits in
+ :param bytes key: The secret key. This must be kept secret. ``128`` bits in
length.