This is where padding goes
diff --git a/docs/primitives/symmetric-encryption.rst b/docs/primitives/symmetric-encryption.rst
index fb1a7cf..08724a0 100644
--- a/docs/primitives/symmetric-encryption.rst
+++ b/docs/primitives/symmetric-encryption.rst
@@ -49,7 +49,7 @@
Modes
~~~~~
-.. class:: cryptography.primitives.block.mode.CBC(initialization_vector)
+.. class:: cryptography.primitives.block.mode.CBC(initialization_vector, padding)
CBC (Cipher block chaining) is a mode of operation for block ciphers. It is
considered cryptographically strong.
@@ -61,3 +61,7 @@
``block_size`` of the cipher. Do not
reuse an ``initialization_vector`` with
a given ``key``.
+ :param padding: One of the paddings described below.
+
+Paddings
+~~~~~~~~