AuthorityKeyIdentifier support
diff --git a/docs/x509.rst b/docs/x509.rst
index e0e05b6..932801b 100644
--- a/docs/x509.rst
+++ b/docs/x509.rst
@@ -652,6 +652,25 @@
purposes indicated in the key usage extension. The object is
iterable to obtain the list of :ref:`extended key usage OIDs <eku_oids>`.
+.. class:: AuthorityKeyIdentifier
+
+ .. versionadded:: 0.9
+
+ The authority key identifier extension provides a means of identifying the
+ public key corresponding to the private key used to sign a certificate.
+
+ .. attribute:: key_identifier
+
+ :type: bytes
+
+ .. attribute:: authority_cert_issuer
+
+ :type: :class:`Name` or None
+
+ .. attribute:: authority_cert_serial_number
+
+ :type: int or None
+
.. class:: SubjectKeyIdentifier
.. versionadded:: 0.9