add SubjectKeyIdentifier.create_from_public_key
diff --git a/docs/x509/reference.rst b/docs/x509/reference.rst
index 61971fe..2ccc527 100644
--- a/docs/x509/reference.rst
+++ b/docs/x509/reference.rst
@@ -1119,6 +1119,21 @@
The binary value of the identifier.
+ .. classmethod:: create_from_public_key(public_key)
+
+ .. versionadded:: 1.0
+
+ Creates a new SubjectKeyIdentifier instance using the public key
+ provided to generate the appropriate digest. This should be the public
+ key that is in the certificate.
+
+ :param public_key: One of
+ :class:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPublicKey`
+ ,
+ :class:`~cryptography.hazmat.primitives.asymmetric.dsa.DSAPublicKey`
+ , or
+ :class:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePublicKey`.
+
.. class:: SubjectAlternativeName
.. versionadded:: 0.9