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
 ~~~~~~~~~~
 
diff --git a/src/cryptography/x509.py b/src/cryptography/x509.py
index 7f3ace4..e280980 100644
--- a/src/cryptography/x509.py
+++ b/src/cryptography/x509.py
@@ -53,7 +53,9 @@
 class NameAttribute(object):
     def __init__(self, oid, value):
         if not isinstance(oid, ObjectIdentifier):
-            raise TypeError("oid argument must be an ObjectIdentifier object")
+            raise TypeError(
+                "oid argument must be an ObjectIdentifier instance."
+            )
 
         self._oid = oid
         self._value = value