Document all the parameters including cross references to specific providers where appropriate.
diff --git a/docs/hazmat/primitives/cryptographic-hashes.rst b/docs/hazmat/primitives/cryptographic-hashes.rst
index 92f8fa3..312d7e6 100644
--- a/docs/hazmat/primitives/cryptographic-hashes.rst
+++ b/docs/hazmat/primitives/cryptographic-hashes.rst
@@ -34,6 +34,14 @@
upgrading the hash algorithm you use over time. For more information, see
`Lifetimes of cryptographic hash functions`_.
+ :param algorithm: A
+ :class:`~cryptography.hazmat.primitives.interfaces.HashAlgorithm`
+ provider such as those described in
+ :ref:`below <cryptographic-hash-algorithms>`.
+ :param backend: A
+ :class:`~cryptography.hazmat.bindings.interfaces.HashBackend`
+ provider.
+
.. method:: update(data)
:param bytes data: The bytes you wish to hash.
@@ -60,6 +68,8 @@
:return bytes: The message digest as bytes.
+.. _cryptographic-hash-algorithms:
+
SHA-1
~~~~~