update doc language to point more strongly at rfc 5280
diff --git a/docs/x509.rst b/docs/x509.rst
index 02c51dd..d99fae6 100644
--- a/docs/x509.rst
+++ b/docs/x509.rst
@@ -658,14 +658,16 @@
The authority key identifier extension provides a means of identifying the
public key corresponding to the private key used to sign a certificate.
+ This extension is typically used to assist in determining the appropriate
+ certificate chain. For more information about generation and use of this
+ extension see `RFC 5280 section 4.2.1.1`_.
.. attribute:: key_identifier
:type: bytes
A value derived from the public key used to verify the certificate's
- signature. See :rfc:`5280` section 4.2.1.2 for more details on the
- recommended way to compute this value.
+ signature.
.. attribute:: authority_cert_issuer
@@ -965,3 +967,4 @@
.. _`public key infrastructure`: https://en.wikipedia.org/wiki/Public_key_infrastructure
.. _`TLS`: https://en.wikipedia.org/wiki/Transport_Layer_Security
+.. _`RFC 5280 section 4.2.1.1`: http://tools.ietf.org/html/rfc5280#section-4.2.1.1