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-rw-r--r--docs/primitives/symmetric-encryption.rst4
1 files changed, 3 insertions, 1 deletions
diff --git a/docs/primitives/symmetric-encryption.rst b/docs/primitives/symmetric-encryption.rst
index 4675ebfc..c0b36084 100644
--- a/docs/primitives/symmetric-encryption.rst
+++ b/docs/primitives/symmetric-encryption.rst
@@ -52,4 +52,6 @@ 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).
+ in a transmitted message). Should be
+ the same number of bytes as the ``key``
+ for the cipher.