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-rw-r--r--docs/hazmat/primitives/hmac.rst2
1 files changed, 2 insertions, 0 deletions
diff --git a/docs/hazmat/primitives/hmac.rst b/docs/hazmat/primitives/hmac.rst
index 301d72d5..bd1a4934 100644
--- a/docs/hazmat/primitives/hmac.rst
+++ b/docs/hazmat/primitives/hmac.rst
@@ -23,6 +23,8 @@ message.
equal in length to the ``digest_size`` of the hash function chosen.
You must keep the ``key`` secret.
+ This is an implementation of :rfc:`2104`.
+
.. doctest::
>>> from cryptography.hazmat.primitives import hashes, hmac