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-rw-r--r--docs/hazmat/primitives/cryptographic-hashes.rst4
1 files changed, 4 insertions, 0 deletions
diff --git a/docs/hazmat/primitives/cryptographic-hashes.rst b/docs/hazmat/primitives/cryptographic-hashes.rst
index 627ca7bd..b7eee2f5 100644
--- a/docs/hazmat/primitives/cryptographic-hashes.rst
+++ b/docs/hazmat/primitives/cryptographic-hashes.rst
@@ -45,6 +45,10 @@ Message Digests
:class:`~cryptography.hazmat.backends.interfaces.HashBackend`
provider.
+ :raises cryptography.exceptions.UnsupportedInterface: This is raised if the
+ provided ``backend`` does not implement
+ :class:`~cryptography.hazmat.backends.interfaces.HashBackend`
+
.. method:: update(data)
:param bytes data: The bytes to be hashed.