merge: DOCS-181

Author: Sam Kleinman

source/release-notes/2.0.txt

@@ -375,6 +375,25 @@ automatically, start the shell with :option:`--norc <mongod --norc>`.
 
 For more information, see :doc:`/reference/mongo`.
 
+Most Commands Require Authentication
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+In 2.0, *all* database commands require that :setting:`auth` is enabled,
+*except for those listed here*. The following commands *do not* require
+that :setting:`auth` is enabled:
+
+- :dbcommand:`isMaster`
+
+- :dbcommand:`authenticate`
+
+- :dbcommand:`getnonce`
+
+- :dbcommand:`buildInfo`
+
+- :dbcommand:`ping`
+
+- :dbcommand:`isdbGrid`
+
 Resources
 ---------