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-rw-r--r--docs/hazmat/primitives/interfaces.rst26
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diff --git a/docs/hazmat/primitives/interfaces.rst b/docs/hazmat/primitives/interfaces.rst
index 7068316e..11cff51a 100644
--- a/docs/hazmat/primitives/interfaces.rst
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@@ -12,11 +12,33 @@ to document argument and return types.
.. _`Abstract Base Classes`: http://docs.python.org/3.2/library/abc.html
-Cipher Modes
-~~~~~~~~~~~~
+Symmetric Ciphers
+~~~~~~~~~~~~~~~~~
.. currentmodule:: cryptography.hazmat.primitives.interfaces
+
+.. class:: CipherAlgorithm
+
+ A named symmetric encryption algorithm.
+
+ .. attribute:: name
+
+ :type: str
+
+ The standard name for the mode, for example, "AES", "Camellia", or
+ "Blowfish".
+
+ .. attribute:: key_size
+
+ :type: int
+
+ The number of bits in the key being used.
+
+
+Cipher Modes
+------------
+
Interfaces used by the symmetric cipher modes described in
:ref:`Symmetric Encryption Modes <symmetric-encryption-modes>`.