add descriptions to each OID constant, update object to instance
diff --git a/docs/x509.rst b/docs/x509.rst
index aea084f..19ff6d7 100644
--- a/docs/x509.rst
+++ b/docs/x509.rst
@@ -220,34 +220,64 @@
.. data:: OID_COMMON_NAME
+ Corresponds to the dotted string "2.5.4.3".
+
.. data:: OID_COUNTRY_NAME
+ Corresponds to the dotted string "2.5.4.6".
+
.. data:: OID_LOCALITY_NAME
+ Corresponds to the dotted string "2.5.4.7".
+
.. data:: OID_STATE_OR_PROVINCE_NAME
+ Corresponds to the dotted string "2.5.4.8".
+
.. data:: OID_ORGANIZATION_NAME
+ Corresponds to the dotted string "2.5.4.10".
+
.. data:: OID_ORGANIZATIONAL_UNIT_NAME
+ Corresponds to the dotted string "2.5.4.11".
+
.. data:: OID_SERIAL_NUMBER
+ Corresponds to the dotted string "2.5.4.5".
+
.. data:: OID_SURNAME
+ Corresponds to the dotted string "2.5.4.4".
+
.. data:: OID_GIVEN_NAME
+ Corresponds to the dotted string "2.5.4.42".
+
.. data:: OID_TITLE
+ Corresponds to the dotted string "2.5.4.12".
+
.. data:: OID_GENERATION_QUALIFIER
+ Corresponds to the dotted string "2.5.4.44".
+
.. data:: OID_DN_QUALIFIER
+ Corresponds to the dotted string "2.5.4.46".
+
.. data:: OID_PSEUDONYM
+ Corresponds to the dotted string "2.5.4.65".
+
.. data:: OID_DOMAIN_COMPONENT
+ Corresponds to the dotted string "0.9.2342.19200300.100.1.25".
+
.. data:: OID_EMAIL_ADDRESS
+ Corresponds to the dotted string "1.2.840.113549.1.9.1".
+
Exceptions
~~~~~~~~~~