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-rw-r--r--docs/primitives/symmetric-encryption.rst6
1 files changed, 4 insertions, 2 deletions
diff --git a/docs/primitives/symmetric-encryption.rst b/docs/primitives/symmetric-encryption.rst
index f79bcacb..5d2177df 100644
--- a/docs/primitives/symmetric-encryption.rst
+++ b/docs/primitives/symmetric-encryption.rst
@@ -51,6 +51,8 @@ Modes
:param bytes initialization_vector: Must be random bytes. They do not need
to be kept secret (they can be included
- in a transmitted message). Should be
- the same number of bytes as the
+ in a transmitted message). Must be the
+ same number of bytes as the
``block_size`` of the cipher.
+ Initialization vectors should not be
+ reused with the same ``key``.