Refs #3461 -- added the OID for the SCT x.509 extension (#3464)

* Refs #3461 -- added the OID for the SCT x.509 extension

* Version added
diff --git a/docs/x509/reference.rst b/docs/x509/reference.rst
index 1823231..1177dba 100644
--- a/docs/x509/reference.rst
+++ b/docs/x509/reference.rst
@@ -2605,6 +2605,12 @@
         the ``CRLNumber`` extension type. This extension only has meaning
         for certificate revocation lists.
 
+    .. attribute:: PRECERT_SIGNED_CERTIFICATE_TIMESTAMPS
+
+        .. versionadded:: 1.9
+
+        Corresponds to the dotted string ``"1.3.6.1.4.1.11129.2.4.2"``.
+
     .. attribute:: POLICY_CONSTRAINTS
 
         Corresponds to the dotted string ``"2.5.29.36"``. The identifier for the
diff --git a/src/cryptography/x509/oid.py b/src/cryptography/x509/oid.py
index 3edac72..1beed0f 100644
--- a/src/cryptography/x509/oid.py
+++ b/src/cryptography/x509/oid.py
@@ -86,6 +86,9 @@
     SUBJECT_INFORMATION_ACCESS = ObjectIdentifier("1.3.6.1.5.5.7.1.11")
     OCSP_NO_CHECK = ObjectIdentifier("1.3.6.1.5.5.7.48.1.5")
     CRL_NUMBER = ObjectIdentifier("2.5.29.20")
+    PRECERT_SIGNED_CERTIFICATE_TIMESTAMPS = (
+        ObjectIdentifier("1.3.6.1.4.1.11129.2.4.2")
+    )
 
 
 class CRLEntryExtensionOID(object):