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-rw-r--r--docs/primitives/symmetric-encryption.rst1
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diff --git a/docs/primitives/symmetric-encryption.rst b/docs/primitives/symmetric-encryption.rst
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+++ b/docs/primitives/symmetric-encryption.rst
@@ -72,6 +72,7 @@ Modes
Insecure Modes
--------------
+.. warning:: Do not use. This is an insecure mode.
.. class:: cryptography.primitives.block.modes.ECB()
ECB (Electronic Code Book) is the simplest mode of operation for block